{"title":"Nitecore","description":"\u003cp\u003eShop NITECORE‘s professional-grade flashlights, smart chargers, and lithium-ion batteries – engineered for those who demand performance, reliability, and innovation. Founded in 2007，NITECORE is the world’s first professional lighting brand to achieve a Grand Slam of the four major global industrial design awards (iF, Red Dot, Good Design, and IDEA). Driven by the philosophy of “Keep Innovating”，NITECORE‘s products are trusted by military, law enforcement, professional outdoor enthusiasts, and content creators worldwide.\u003c\/p\u003e\n\u003cp\u003eWe stock popular NITECORE products including the VC4SL, VC4 Plus, and UMS4 smart chargers，i2\/i4\/i8 multi-slot intelligent chargers，NL series high-performance protected Li-ion batteries (NL1836, NL1835R, NL1840R with USB-C, NL2155HPi, and more)，and a selection of NITECORE flashlights and power solutions. All units are genuine, in-stock, and ready to ship. Browse our collection to find the right lighting and power solution for your needs.\u003c\/p\u003e","products":[{"product_id":"nitecore-ci2-intelligent-dual-slot-quick-usb-c-battery-charger-for-li-ion-ni-mh-ni-cd-imr-16340-14500-18650-21700-22500-aa-aaa-c-dand-more-batteries","title":"NITECORE Ci2 2-Bay Smart Battery Charger | USB-C QC\/PD 3000mA Fast Charge for 3.6V\/3.7V Li-ion \u0026 1.2V Ni-MH Batteries","description":"\u003ch2\u003e\u003cspan class=\"\"\u003eProduct Description\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eThe NITECORE Ci2 is a highly intelligent and powerful 2-slot battery charger designed for versatile and efficient battery management. Featuring a modern USB-C input that supports QC and PD fast charging protocols (up to 18W), it delivers an impressive 3000mA maximum output for a single slot in fast charge mode. The Ci2 utilizes an automatic current distribution system to intelligently allocate the optimal charging current across its two slots based on battery capacity and type. It includes a proprietary battery activation function to revive over-discharged Li-ion batteries and an optimized charging program specifically for IMR batteries to enhance lifespan. Constructed with flame-retardant PC materials and equipped with comprehensive safety protections, the NITECORE Ci2 is a reliable, fast, and compact charging solution for your everyday devices and outdoor gear.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003e3000mA Ultra-Fast Charging \u0026amp; QC\/PD Support: In fast charge mode, it provides up to 3000mA for a single slot and 1500mA per slot for two slots. Standard mode offers 2000mA for a single slot and 1000mA per slot for two slots. Features a USB-C port that intelligently recognizes QC and PD chargers (5V\/2A, 9V\/2A, 12V\/1.5A, 18W max).\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eAutomatic Current Distribution \u0026amp; Smart Charging: Built-in microchip automatically identifies battery capacity and type, then intelligently allocates the ideal charging current. Simply insert the batteries and let the Ci2 handle the rest.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eOptimized Program for IMR Batteries: Features a tailored charging algorithm designed specifically for IMR batteries, with comprehensive monitoring to keep the charging cut-off voltage strictly within the safe 4.2V range, significantly extending battery life.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eIntelligent Battery Activation Function: Automatically detects and safely activates over-discharged Li-ion batteries equipped with protection circuits. If a battery is damaged and cannot be revived, all LED indicators will flash rapidly to notify the user.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eClear LED Status Indicators: Displays real-time battery charge status via intuitive LED lights. One green light indicates approximately 30% charge; two green lights indicate approximately 60% charge; three green lights indicate fully charged. A red light indicates active fast charging mode.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eDual External \u0026amp; Internal Safety Protections: Externally built with premium PC flame-retardant material and an efficient heat dissipation fin design. Internally, it features charging timeout protection, anti-reverse polarity and short-circuit protection, and an intelligent temperature control program.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eAutomatic Energy-Saving Mode: When the charger is connected to a power source but no batteries are inserted, all indicator lights automatically turn off to reduce power consumption and minimize standby energy loss.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eProduct Parameters\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eBrand: NITECORE\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eModel: Ci2\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eInput Voltage: DC 5V\/2A, 9V\/2A, 12V\/1.5A (18W Max, USB-C)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eOutput Voltage: 4.2V ±1% \/ 1.48V ±1%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eOutput Current (Fast Mode): 3000mA\u003c\/span\u003e\u003cem\u003e\u003cspan class=\"\"\u003e1 (Max), 1500mA\u003c\/span\u003e\u003c\/em\u003e\u003cspan class=\"\"\u003e2 (Max)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eOutput Current (Standard Mode): 2000mA\u003c\/span\u003e\u003cem\u003e\u003cspan class=\"\"\u003e1 (Max), 1000mA\u003c\/span\u003e\u003c\/em\u003e\u003cspan class=\"\"\u003e2 (Max)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eDimensions: 148mm x 65mm x 37mm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eNet Weight: 120.4g (excluding cable)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eSupported Battery Types: 3.6V \/ 3.7V Li-ion (IMR\/INR\/ICR), 1.2V Ni-MH \/ Ni-CD\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eSupported Li-ion\/IMR Sizes: 10440, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 21700, 22500, 22650, 25500, 26500, 26650, 26700\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eSupported Ni-MH\/Ni-CD Sizes: AA, AAA, AAAA, C, D\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eRapid daily charging and maintenance for high-performance EDC tactical flashlights and searchlights.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eFast and optimized power replenishment for IMR batteries used in high-wattage electronic cigarettes .\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003ePortable power station for camping gear via USB-C connection to mobile power or solar panels.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eConvenient and efficient charging hub for AA\/AAA Ni-MH batteries used in household electronics.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eFrequently Asked Questions (FAQ)\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ1: What is the maximum charging current of the NITECORE Ci2?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA1: In fast charging mode, the Ci2 provides a maximum of 3000mA for a single slot, or 1500mA per slot when charging two batteries simultaneously. In standard mode, it provides 2000mA for a single slot, or 1000mA per slot for two batteries.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ2: How do I achieve the fastest possible charging speed?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA2: To reach the peak 3000mA output, you must use a QC or PD power adapter (supporting 9V\/2A or 12V\/1.5A input) and charge a single lithium-ion battery in only one slot.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ3: Does the Ci2 support 21700 batteries or LiFePO4 batteries?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA3: Yes, it fully supports 21700 batteries (as well as larger sizes like 26650). However, it does NOT support 3.2V LiFePO4 batteries, as it utilizes a fixed 4.2V cut-off voltage designed specifically for 3.6V\/3.7V Li-ion cells.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ4: What do the LED indicator lights mean?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA4: 1 green light indicates roughly 30% charge; 2 green lights indicate roughly 60% charge; 3 green lights mean fully charged. A red light indicates active fast charging. If all LEDs flash rapidly, it indicates a battery activation failure or a damaged battery.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ5: Can I charge Li-ion and Ni-MH batteries at the same time?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA5: Yes. The Ci2 features two independent charging slots with automatic current distribution. You can safely charge a Li-ion battery in one slot and a Ni-MH battery in the other slot simultaneously.\u003c\/span\u003e\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454159061238,"sku":"OAS420","price":28.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/imagesnitecore-ci2-dual-usb-c-charger-main_10e61868-e885-4911-b92e-a73ac8a83ef2.webp?v=1786965986"},{"product_id":"nitecore-ci4-18650-battery-charger21700-qc-pd-battery-charger-for-3-7v-14500-10400-18500-18350-18650-18700-20700-21700-22650-26650-li-ion-battery1-2v-ni-mh-ni-cd-battery4-bay-18650-usb-charger","title":"NITECORE Ci4 4-Bay Smart Battery Charger | USB-C QC\/PD 3000mA Fast Charge for 3.6V\/3.7V Li-ion \u0026 1.2V Ni-MH Batteries","description":"\u003ch2\u003e\u003cspan class=\"\"\u003eProduct Description\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eThe NITECORE Ci4 is a highly intelligent and powerful 4-slot battery charger engineered for efficient multi-battery management. Featuring a modern USB-C input that supports QC and PD fast charging protocols (up to 18W), it delivers an impressive 3000mA maximum output for a single slot in fast charge mode. The Ci4 utilizes an automatic current distribution system to intelligently allocate the optimal charging current across all four slots based on battery capacity and type. It includes a proprietary battery activation function to revive over-discharged Li-ion batteries and an optimized charging program specifically for IMR batteries to enhance lifespan. Constructed with flame-retardant PC materials and equipped with comprehensive safety protections, the NITECORE Ci4 is the ultimate, reliable charging station for your demanding outdoor gear and daily electronics.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003e3000mA Ultra-Fast Multi-Slot Charging: In fast charge mode, it delivers up to 3000mA for a single slot; 1500mA per slot for two slots; 1000mA per slot for three slots; and 750mA per slot for four slots. Standard mode offers 2000mA for a single slot, 1000mA per slot for two slots, 700mA per slot for three slots, and 500mA per slot for four slots.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQC\/PD Dual Fast Charge Protocols: Features a versatile USB-C port that intelligently recognizes QC and PD chargers (5V\/2A, 9V\/2A, 12V\/1.5A, 18W max) to ensure optimal high-speed power input.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eAutomatic Current Distribution \u0026amp; Smart Charging: Built-in microchip automatically identifies battery capacity and type, then intelligently allocates the ideal charging current. Simply insert the batteries and let the Ci4 handle the rest.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eOptimized Program for IMR Batteries: Features a tailored charging algorithm designed specifically for IMR batteries, with comprehensive monitoring to keep the charging cut-off voltage strictly within the safe 4.2V range, significantly extending battery life.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eIntelligent Battery Activation Function: Automatically detects and safely activates over-discharged Li-ion batteries equipped with protection circuits. If a battery is damaged and cannot be revived, all LED indicators will flash rapidly to notify the user.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eClear LED Status Indicators: Displays real-time battery charge status via intuitive LED lights. One green light indicates approximately 30% charge; two green lights indicate approximately 60% charge; three green lights indicate fully charged. A red light indicates active fast charging mode.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eDual External \u0026amp; Internal Safety Protections: Externally built with premium PC flame-retardant material and an efficient heat dissipation fin design. Internally, it features charging timeout protection, anti-reverse polarity and short-circuit protection, and an intelligent temperature control program.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eAutomatic Energy-Saving Mode: When the charger is connected to a power source but no batteries are inserted, all indicator lights automatically turn off to reduce power consumption and minimize standby energy loss.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eProduct Parameters\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eBrand: NITECORE\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eModel: Ci4\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eInput Voltage: DC 5V\/2A, 9V\/2A, 12V\/1.5A (18W Max, USB-C)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eOutput Voltage: 4.2V ±1% \/ 1.48V ±1%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eOutput Current (Fast Mode): 3000mA\u003c\/span\u003e\u003cem\u003e\u003cspan class=\"\"\u003e1 (Max), 1500mA\u003c\/span\u003e\u003c\/em\u003e\u003cspan class=\"\"\u003e2 (Max), 1000mA\u003c\/span\u003e\u003cem\u003e\u003cspan class=\"\"\u003e3 (Max), 750mA\u003c\/span\u003e\u003c\/em\u003e\u003cspan class=\"\"\u003e4 (Max)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eOutput Current (Standard Mode): 2000mA\u003c\/span\u003e\u003cem\u003e\u003cspan class=\"\"\u003e1 (Max), 1000mA\u003c\/span\u003e\u003c\/em\u003e\u003cspan class=\"\"\u003e2 (Max), 700mA\u003c\/span\u003e\u003cem\u003e\u003cspan class=\"\"\u003e3 (Max), 500mA\u003c\/span\u003e\u003c\/em\u003e\u003cspan class=\"\"\u003e4 (Max)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eDimensions: 148mm x 105mm x 37mm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eNet Weight: 191.4g (excluding cable)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eSupported Battery Types: 3.6V \/ 3.7V Li-ion (IMR\/INR\/ICR), 1.2V Ni-MH \/ Ni-CD\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eSupported Li-ion\/IMR Sizes: 10440, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 21700, 22500, 22650, 25500, 26500, 26650, 26700\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eSupported Ni-MH\/Ni-CD Sizes: AA, AAA, AAAA, C, D\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eRapid batch charging and maintenance for high-performance EDC tactical flashlights, searchlights, and headlamps.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eMulti-battery management for 18650\/21700 cells used in outdoor power stations and camping equipment.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eSafe and optimized high-speed charging for IMR batteries used in high-drain electronic cigarettes.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eComprehensive battery activation and maintenance for emergency kits and portable communication devices.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eAn all-in-one smart charging hub for large households managing diverse Li-ion and Ni-MH battery collections.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eFrequently Asked Questions (FAQ)\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ1: What is the maximum charging current of the NITECORE Ci4?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA1: In fast charging mode, the Ci4 provides a maximum of 3000mA for a single slot, 1500mA per slot for two slots, 1000mA per slot for three slots, or 750mA per slot for four slots. In standard mode, it provides 2000mA (1 slot), 1000mA (2 slots), 700mA (3 slots), or 500mA (4 slots).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ2: How do I achieve the fastest possible charging speed?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA2: To reach the peak 3000mA output, you must use a QC or PD power adapter (supporting 9V\/2A or 12V\/1.5A input) and charge a single lithium-ion battery in only one slot.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ3: Does the Ci4 support 21700 batteries or LiFePO4 batteries?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA3: Yes, it fully supports 21700 batteries (as well as larger sizes like 26650). However, it does NOT support 3.2V LiFePO4 batteries, as it utilizes a fixed 4.2V cut-off voltage designed specifically for 3.6V\/3.7V Li-ion cells.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ4: What do the LED indicator lights mean?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA4: 1 green light indicates roughly 30% charge; 2 green lights indicate roughly 60% charge; 3 green lights mean fully charged. A red light indicates active fast charging. If all LEDs flash rapidly, it indicates a battery activation failure or a damaged battery.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ5: Can I charge Li-ion and Ni-MH batteries at the same time?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA5: Yes. The Ci4 features four independent charging slots with automatic current distribution. You can safely charge a Li-ion battery in one slot and a Ni-MH battery in another slot simultaneously.\u003c\/span\u003e\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454159094006,"sku":"OAS421","price":38.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/imagesnitecore-ci4-4bay-usb-c-charger-main_35c21482-1063-4fd9-9da9-6dd1a3803b48.webp?v=1786965988"},{"product_id":"nitecore-ums2-intelligent-dual-slot-quick-usb-c-battery-charger-for-li-ion-ni-mh-ni-cd-imr-16340-14500-18650-21700-20700-aa-aaa-and-more-batteries","title":"NITECORE UMS2 2-Bay Smart Battery Charger | USB-C QC 3000mA Fast Charge with LCD Health Monitor for 3.6V\/3.7V Li-ion, 3.2V LiFePO4 \u0026 1.2V Ni-MH Batteries","description":"\u003ch2\u003e\u003cspan class=\"\"\u003eProduct Description\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eThe NITECORE UMS2 is a highly advanced 2-slot smart battery charger designed for professionals and enthusiasts who demand precision and reliability. Equipped with a bright LCD display, it provides real-time monitoring of charging current, battery voltage, charged capacity, and even internal resistance to assess battery health. Supporting USB-C input with QC fast charging (up to 18W), it delivers a remarkable 3000mA maximum output for a single slot. The UMS2 features a customizable charging mode with adjustable voltages (4.35V, 4.2V, 3.7V, 1.48V) to accommodate a wide range of battery chemistries, including standard 3.6V\/3.7V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH\/Ni-CD. It also includes an IMR battery repair function and an over-discharged battery activation feature. Built with flame-retardant PC materials and intelligent temperature control, the NITECORE UMS2 is the ultimate smart charging solution for your high-performance devices.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003e3000mA Ultra-Fast Charging \u0026amp; QC Support: In fast charge mode, it provides up to 3000mA for a single slot and 2000mA per slot for two slots. Features a USB-C port that supports QC fast charging (5V\/2A, 9V\/2A, up to 18W), ensuring quick power replenishment.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eReal-Time LCD Monitoring \u0026amp; Battery Health Test: The high-definition LCD screen displays real-time charging current, voltage, charged capacity, and battery type. It also performs an automatic internal resistance (IR) test to assess battery health, displaying \"Good\" or \"Poor\" status on the screen.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eAdjustable Multi-Voltage \u0026amp; Multi-Chemistry Support: Offers adjustable charging voltages (4.35V, 4.2V, 3.7V, 1.48V) to support a wide range of battery types, including high-voltage 3.6V\/3.7V Li-ion, IMR, 3.2V LiFePO4, and 1.2V Ni-MH\/Ni-CD batteries.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eIMR Battery Repair \u0026amp; Activation Functions: Features a dedicated repair mode for over-discharged IMR batteries (indicated by \"EEEE\" on the display). Simply long-press the \"V\" button to start the repair process. It also automatically activates over-discharged Li-ion batteries with protection circuits.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eSafety Protections \u0026amp; Smart Cooling: Built with premium PC flame-retardant material and a unique cooling fin design. It features full-automatic intelligent temperature control, overcharging timeout protection, reverse polarity and short-circuit protection (indicated by flashing \"EE\").\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eEnergy-Saving Mode: The LCD screen automatically dims after 10 minutes of inactivity to save power and reduce eye strain in dark environments.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eProduct Parameters\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eBrand: NITECORE\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eModel: UMS2\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eInput Voltage: DC 5V\/2A, 9V\/2A (Max 18W, USB-C)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eOutput Voltage: 4.35V ±1% \/ 4.2V ±1% \/ 3.7V ±1% \/ 1.48V ±1%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eOutput Current (Fast Mode): 3000mA\u003c\/span\u003e\u003cem\u003e\u003cspan class=\"\"\u003e1 (Max), 2000mA\u003c\/span\u003e\u003c\/em\u003e\u003cspan class=\"\"\u003e2 (Max)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eOutput Current (Standard Mode): 2000mA\u003c\/span\u003e\u003cem\u003e\u003cspan class=\"\"\u003e1 (Max), 1000mA\u003c\/span\u003e\u003c\/em\u003e\u003cspan class=\"\"\u003e2 (Max)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eDimensions: 152mm x 73mm x 40mm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eNet Weight: 157.7g (excluding cable)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eSupported Battery Types:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e 3.6V \/ 3.7V Li-ion (IMR\/INR\/ICR), 3.2V \/ 3.3V LiFePO4, 1.2V Ni-MH \/ Ni-CD\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eSupported Li-ion\/IMR\/LiFePO4 Sizes:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e 10440, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eSupported Ni-MH\/Ni-CD Sizes:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e AA, AAA, AAAA, C, D\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eProfessional battery management and health diagnosis for high-performance EDC tactical flashlights and searchlights.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eAdvanced charging and repair for 18650\/21700 batteries used in high-wattage electronic cigarettes.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eReliable outdoor charging station for camping gear, solar panels, and power banks via USB-C input.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eCustomizable charging and testing for LiFePO4 batteries in DIY power stations and solar projects.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eA high-precision charging hub for maintaining AA\/AAA Ni-MH batteries for household electronics.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eFrequently Asked Questions (FAQ)\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ1: Does the UMS2 support 21700 batteries?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA1: Yes, the UMS2 is fully compatible with 21700 batteries, as well as larger cells like 26650 and 26700, thanks to its extended slot design.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ2: How does the battery health monitoring function work?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA2: Once a battery is inserted, the charger automatically performs an internal resistance test. The screen will display the resistance value in mΩ and indicate the health status as \"Good\" or \"Poor\", helping you identify aged or degraded cells.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ3: What is the IMR battery repair function?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA3: If you insert an over-discharged IMR battery, the screen will display \"EEEE\" to indicate it needs repair. You can long-press the \"V\" button to enter repair mode, and once complete, it will automatically switch to the normal charging mode.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ4: Can I charge LiFePO4 batteries with the UMS2?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA4: Yes, the UMS2 fully supports 3.2V\/3.3V LiFePO4 batteries. It offers adjustable charging voltages, allowing you to select the appropriate profile based on the specific cell requirements.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ5: What do the flashing \"EE\" error messages indicate?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA5: The flashing \"EE\" on the display indicates a reverse polarity connection or a short circuit. Please immediately remove the battery, check for correct polarity, and reinsert it properly to resume safe charging.\u003c\/span\u003e\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454160273654,"sku":"OAS424","price":56.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/imagesnitecore-ums2-dual-usb-c-charger-main_5d65368b-1611-4d8c-9991-0580ded9d1ef.webp?v=1786965988"},{"product_id":"nitecore-ums4-intelligent-usb-c-four-slot-quick-battery-charger-for-li-ion-ni-mh-ni-cd-imr-16340-14500-18650-21700-20700-aa-aaa-and-more-batteries","title":"NITECORE UMS4 4-Bay Smart Battery Charger | USB-C QC 3000mA Fast Charge with LCD Health Monitor for 3.6V\/3.7V Li-ion, 3.2V LiFePO4 \u0026 1.2V Ni-MH Batteries","description":"\u003ch2\u003e\u003cspan class=\"\"\u003eProduct Description\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eThe NITECORE UMS4 is a premium 4-slot intelligent battery charger designed for enthusiasts and professionals managing multiple batteries. It features a USB-C input supporting QC 2.0 fast charging (up to 18W) and delivers a powerful 3000mA maximum output for a single slot. The high-definition LCD screen provides comprehensive real-time data, including charging current, voltage, and internal resistance, enabling accurate battery health assessment (Good\/Poor). With adjustable charging voltages (4.35V, 4.2V, 3.7V, 1.48V), it supports a wide range of chemistries, including standard 3.6V\/3.7V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH\/Ni-CD. Built-in IMR repair, over-discharge activation, and PC flame-retardant materials ensure safety and longevity.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003e3000mA Fast Charge \u0026amp; QC 2.0 Support: Single slot max 3000mA output. Supports 5V\/2A, 9V\/2A, 12V\/1.5A QC 2.0 input (18W max).\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eReal-time LCD Monitoring \u0026amp; IR Health Test: HD LCD displays voltage, current, charged capacity, and internal resistance. Automatically grades battery health as \"Good\" or \"Poor\".\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eAdjustable Multi-Voltage \u0026amp; Multi-Chemistry Support: Selectable output voltages (4.35V, 4.2V, 3.7V, 1.48V) for 3.6V\/3.7V Li-ion, 3.2V LiFePO4, IMR, and 1.2V Ni-MH\/Ni-CD batteries.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eIMR Battery Repair \u0026amp; Activation: Displays \"EEEE\" for over-discharged IMR cells; long-press \"V\" to repair. Automatically activates over-discharged protected Li-ion batteries.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003e4 Independent Slots: Supports simultaneous mixed charging of different battery types and sizes, with independent circuits.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eAdvanced Safety \u0026amp; Cooling: PC flame-retardant material, unique cooling fins, intelligent temperature control, over-charge timeout protection, reverse polarity and short-circuit protection (flashing \"EE\").\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eEnergy-Saving Mode: LCD screen automatically dims after 3 minutes of inactivity.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eProduct Parameters\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eBrand: NITECORE\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eModel: UMS4\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eInput Voltage: DC 5V\/2A, 9V\/2A, 12V\/1.5A (Max 18W, USB-C)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eOutput Voltage: 4.35V ±1%, 4.2V ±1%, 3.7V ±1%, 1.48V ±1%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eOutput Current: 3000mA\u003c\/span\u003e\u003cem\u003e\u003cspan class=\"\"\u003e1 (Max), 2000mA\u003c\/span\u003e\u003c\/em\u003e\u003cspan class=\"\"\u003e2 (Max), 1000mA*4 (Max)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eDimensions: 159 x 107 x 41 mm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eNet Weight: 255.4g (excluding cable)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eSupported Battery Types:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e 3.6V \/ 3.7V Li-ion (IMR\/INR\/ICR), 3.2V \/ 3.3V LiFePO4, 1.2V Ni-MH \/ Ni-CD\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eSupported Li-ion\/IMR\/LiFePO4 Sizes:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e 10440, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eSupported Ni-MH\/Ni-CD Sizes:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e AA, AAA, AAAA, C, D\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eProfessional maintenance and health diagnosis for high-end EDC tactical flashlights.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan style=\"background-color: transparent; color: inherit; font-size: inherit; letter-spacing: inherit; text-decoration-line: underline;\"\u003eSimultaneous mixed-charging station for managing multiple household electronics batteries (Li-ion, LiFePO4 \u0026amp; \u003c\/span\u003eNi-MH\u003cspan style=\"background-color: transparent; color: inherit; font-size: inherit; letter-spacing: inherit; text-decoration-line: underline;\"\u003e).\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eCustomizable charging for LiFePO4 batteries in DIY power stations and solar projects.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eOutdoor power hub for camping gear, utilizing solar panel or mobile power USB-C input.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eFrequently Asked Questions (FAQ)\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ1: Does the UMS4 support 21700 batteries?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA1: Yes, the UMS4 is fully compatible with 21700 batteries, as well as larger cells like 26650 and 26700.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ2: How does the battery health monitoring function work?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA2: Once a battery is inserted, the charger automatically performs an internal resistance test. The screen will display the resistance value in mΩ and indicate the health status as \"Good\" (resistance \u0026lt; 250mΩ) or \"Poor\" (resistance \u0026gt; 250mΩ), helping you identify aged or degraded cells.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ3: What is the IMR battery repair function?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA3: If you insert an over-discharged IMR battery, the screen will display \"EEEE\" to indicate it needs repair. You can long-press the \"V\" button to enter repair mode, and once complete, it will automatically switch to the normal charging mode.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ4: Can I charge LiFePO4 batteries with the UMS4?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA4: Yes, the UMS4 fully supports 3.2V\/3.3V LiFePO4 batteries. It offers adjustable charging voltages, allowing you to select the appropriate profile based on the specific cell requirements.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ5: What do the flashing \"EE\" error messages indicate?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA5: The flashing \"EE\" on the display indicates a reverse polarity connection or a short circuit. Please immediately remove the battery, check for correct polarity, and reinsert it properly to resume safe charging.\u003c\/span\u003e\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454160306422,"sku":"OAS425","price":63.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/imagesnitecore-ums4-4bay-usb-c-charger-main_959bfb0e-1c28-40c3-a1f5-7f0391976aa8.webp?v=1786965989"},{"product_id":"samsung-25r-2500mah-20a-button-top-battery-2-pack-with-nitecore-um2-smart-charger-high-drain-power-kit-for-vapes-flashlights-and-cordless-tools","title":"Samsung 25R 2500mAh 20A Button Top Battery 2-Pack with Nitecore UM2 Smart Charger – High-Drain Power Kit for  Flashlights, and Cordless Tools","description":"\u003ch3 class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eWhat’s in This Bundle:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e2x Samsung 25R 2500mAh 20A Button Top Batteries\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Factory-fresh, high-drain 18650 cells.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e1x Nitecore UM2 Intelligent Dual-Slot Charger\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Smart charging with LCD display and QC 2.0 fast input.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e1x USB-C Charging Cable\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Ready to plug into wall adapters, power banks, or laptops.\u003c\/span\u003e\n\u003cbr\u003e\u003cem\u003e\u003cspan class=\"\"\u003e(Note: This kit does not include an AC wall adapter.)\u003c\/span\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Button Top. Looking for Flat Top? \u003ca href=\"https:\/\/oneandes.com\/product\/samsung-25r-2500mah-20a-flat-top-battery-2-pack-with-nitecore-um2-smart-charger-high-drain-power-bundle-for-edc-lights-drones-and-custom-packs\/\"\u003eClick here to buy: Samsung 25R Flat Top + Nitecore UM2 Bundle.\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003ch3 class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eProduct Description:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eMost 18650 batteries can't handle serious punishment. The Samsung 25R is the exception. For years, it's been the go-to choice for enthusiasts and tradespeople who refuse to compromise on power delivery. \u003c\/span\u003e\u003cspan class=\"\"\u003eIt delivers a rock-solid \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e20A continuous discharge\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e, which means your high-wattage  tactical flashlight, or cordless tool gets consistent current without performance drops.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eThis kit pairs two factory-fresh 25R button-top cells with the \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eNitecore UM2 charger\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e.\u003c\/span\u003e\u003cspan class=\"\"\u003e The UM2 is more than a simple power brick. It uses a smart chip to automatically detect battery chemistry, then applies the ideal charging profile. The bright LCD screen gives you real-time readings on voltage, current, and capacity, so you know exactly what's happening.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eIt supports \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQC 2.0 fast input\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e, pushing up to \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e1500mA into each slot\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e.\u003c\/span\u003e\u003cspan class=\"\"\u003e That means a 3500mAh battery hits 80% charge in just over two hours. There's also an IMR-optimized program that keeps high-current cells running at their peak, plus an over-discharge repair function that can revive batteries you'd otherwise toss.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eYou get a power solution that actually works, day after day.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eKey Benefits:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e20A continuous output\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Real, sustained power for demanding electronics.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eUp to 35A pulse burst\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Handles short-duration power spikes without breaking a sweat.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eFast QC 2.0 charging\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – 1500mA per slot means less waiting.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eSmart battery detection\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – The UM2 reads your battery and picks the right charge curve automatically.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eLCD status screen\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Check voltage, current, and capacity in real time.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eRepair mode included\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Revives over-discharged or deeply drained cells.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eFull safety suite\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Reverse polarity, short-circuit, and heat protection all built-in.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eTechnical Specifications:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eBattery - Samsung 25R (Button Top):\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eBrand: Samsung SDI\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eModel: INR18650-25R\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eCapacity: 2500mAh\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eVoltage: 3.6V \/ 3.7V\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eContinuous Discharge: 20A\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003ePulse Discharge: Up to 35A (short bursts only)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eStandard Discharge: 10A (for longer cycle life)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eInternal Resistance: ≤18mΩ\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eChemistry: Li-ion NMC\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eCut-Off Voltage: 2.5V\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eOperating Temp (Discharge): -20°C to 75°C\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eCycle Life: 250+ cycles at 20A\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eWeight: 45g\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eCharger - Nitecore UM2:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eInput: DC 5V\/2A, 9V\/2A (QC 2.0)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eMax Output: 1500mA per slot\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eTotal Output: 3000mA\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eDisplay: LCD (voltage, current, capacity)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eProtection: Reverse polarity, short-circuit, overheat, over-charge\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eComplete Battery Compatibility List:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"ds-scroll-area ds-scroll-area--show-on-focus-within ds-scroll-area--enabled _1210dd7 c03cafe9\"\u003e\n\u003cdiv class=\"ds-scroll-area__gutters\"\u003e\n\u003cdiv class=\"ds-scroll-area__horizontal-gutter\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"ds-scroll-area__vertical-gutter\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctr\u003e\n\u003cth\u003e\u003cspan class=\"\"\u003eBattery Type\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan class=\"\"\u003eSupported Models\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan class=\"\"\u003eVoltage\u003c\/span\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eLi-ion \/ IMR\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e10440, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e3.6V \/ 3.7V \/ 4.35V\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eLiFePO4\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e(All compatible Li-ion sizes above)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e3.2V\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eNi-MH \/ Ni-Cd\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eAA, AAA, AAAA, C, D\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e1.2V\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eDimensions: 152mm × 73mm × 40mm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eWeight: 148.3g\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eApplications:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eHigh-wattage and rebuildable atomizers\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eHigh-lumen tactical flashlights and searchlights\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eCordless drills, impact drivers, and rotary tools\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eHigh-torque RC cars and drones\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003ePortable power stations and battery banks\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eFrequently Asked Questions (FAQ):\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ1: What's the real-world difference between 20A continuous and 35A pulse?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: The 20A rating is the safe, long-term current you can pull without damaging the cell. The 35A rating is what the battery can deliver in short, milliseconds-long bursts—like pressing a high-wattage fire button or starting a motor. You shouldn't run it at 35A continuously; that would overheat the cell and shorten its life. Treat it as a 20A battery and you'll be fine.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ2: Can I use the UM2 charger with LiFePO4 batteries?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: Yes. The UM2 automatically detects LiFePO4 cells and switches to the correct 3.2V charge profile. No manual setup is required.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ3: What should I do if the charger shows \"EE EE\" on the screen?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: That's the charger's way of saying it found a battery that's been over-discharged or is possibly damaged. The UM2 has a built-in repair mode—just press and hold the \"V\" button to try to revive a deeply drained cell.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ4: Can I charge different battery sizes at the same time?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: Absolutely. The UM2 has two independent slots, so you can charge an 18650 in one slot and a 21700 in the other without any issues. Check the compatibility list above to ensure both sizes are supported.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ5: Can I power the UM2 from a power bank or solar panel?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: Yes. The USB-C input makes it compatible with wall adapters, power banks, car chargers, and even portable solar panels—ideal for field use or road trips.\u003c\/span\u003e\u003c\/p\u003e\n\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Button Top. For Flat Top\u003ca href=\"https:\/\/oneandes.com\/product\/samsung-25r-2500mah-20a-flat-top-battery-2-pack-with-nitecore-um2-smart-charger-high-drain-power-bundle-for-edc-lights-drones-and-custom-packs\/\"\u003e click here\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454220566774,"sku":"OAS1657","price":35.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-um2-samsung-25r-button-top-2pack-lcd-kit-main_0b74a61a-c6a1-462d-9b58-8afe5ffd7189.webp?v=1786968467"},{"product_id":"samsung-25r-2500mah-20a-flat-top-battery-2-pack-with-nitecore-um2-smart-charger-high-drain-power-bundle-for-edc-lights-drones-and-custom-packs","title":"Samsung 25R 2500mAh 20A Flat Top Battery 2-Pack with Nitecore UM2 Smart Charger – High-Drain Power Bundle for EDC Lights, Drones, and Custom Packs","description":"\u003ch3 class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eWhat’s in This Bundle:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e2x Samsung 25R 2500mAh 20A Flat Top Batteries\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Factory-fresh, high-drain 18650 cells.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e1x Nitecore UM2 Intelligent Dual-Slot Charger\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Smart charging with LCD display and QC 2.0 fast input.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e1x USB-C Charging Cable\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Ready to plug into wall adapters, power banks, or laptops.\u003c\/span\u003e\n\u003cbr\u003e\u003cem\u003e\u003cspan class=\"\"\u003e(Note: This kit does not include an AC wall adapter.)\u003c\/span\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Flat Top. Looking for Button Top? \u003ca href=\"https:\/\/oneandes.com\/product\/samsung-30q-3000mah-15a-button-top-battery-4-pack-with-xtar-vc4sl-charger-high-drain-power-kit-for-vapes-tactical-flashlights-power-tools\/\"\u003eClick here to buy: Samsung \u003c\/a\u003e\u003ca href=\"https:\/\/oneandes.com\/product\/samsung-25r-2500mah-20a-button-top-battery-2-pack-with-nitecore-um2-smart-charger-high-drain-power-kit-for-vapes-flashlights-and-cordless-tools\/\"\u003e 25R Button Top + Nitecore UM2\u003c\/a\u003e\u003ca href=\"https:\/\/oneandes.com\/product\/samsung-30q-3000mah-15a-button-top-battery-4-pack-with-xtar-vc4sl-charger-high-drain-power-kit-for-vapes-tactical-flashlights-power-tools\/\"\u003e Bundle.\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003ch3 class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eProduct Description:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eIf you're building a custom battery pack or running high-performance EDC gear, you need a cell that delivers under load. The Samsung 25R has been the trusted standard for years, and for good reason. It puts out a genuine \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e20A continuous discharge\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e—enough to handle heavy-duty flashlights, drones, or DIY power packs without voltage sag or overheating.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eThis bundle gives you \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003etwo brand-new 25R flat-top cells\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e and the \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eNitecore UM2 charger\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e. The UM2 takes the guesswork out of charging. It detects battery chemistry automatically—Li-ion, IMR, LiFePO4, or Ni-MH—and applies the exact charging profile the cell needs. The LCD panel shows you voltage, current, and capacity in real time, so you're not left wondering.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eIt supports \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQC 2.0 input\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e, pushing up to \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e1500mA per slot\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e. That means a 3500mAh cell can reach 80% charge in just over two hours. It also includes an IMR-optimized charge program for high-drain cells, and a repair mode that can revive over-discharged batteries you'd normally throw away.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eReliable power doesn't need to be complicated. This kit gets it right.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eKey Benefits:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e20A continuous output\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Stable, sustained current for high-drain builds.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eUp to 35A pulse burst\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Handles sharp power spikes when you need them.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eFast QC 2.0 charging\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – 1500mA per slot cuts down charge times.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eSmart battery detection\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – The UM2 reads your battery and picks the right charging mode.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eLCD real-time display\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – View voltage, current, and capacity instantly.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eBuilt-in repair mode\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Revives over-discharged or dead cells.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eComprehensive safety\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Reverse polarity, short-circuit, and overheat protection.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eTechnical Specifications:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eBattery - Samsung 25R (Flat Top):\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eBrand: Samsung SDI\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eModel: INR18650-25R\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eCapacity: 2500mAh\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eVoltage: 3.6V \/ 3.7V\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eContinuous Discharge: 20A\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003ePulse Discharge: Up to 35A (short bursts only)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eStandard Discharge: 10A (for longer cycle life)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eInternal Resistance: ≤18mΩ\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eChemistry: Li-ion NMC\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eCut-Off Voltage: 2.5V\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eOperating Temp (Discharge): -20°C to 75°C\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eCycle Life: 250+ cycles at 20A\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eWeight: 45g\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eCharger - Nitecore UM2:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eInput: DC 5V\/2A, 9V\/2A (QC 2.0)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eMax Output: 1500mA per slot\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eTotal Output: 3000mA\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eDisplay: LCD (voltage, current, capacity)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eProtection: Reverse polarity, short-circuit, overheat, over-charge\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eComplete Battery Compatibility List:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"ds-scroll-area ds-scroll-area--show-on-focus-within ds-scroll-area--enabled _1210dd7 c03cafe9\"\u003e\n\u003cdiv class=\"ds-scroll-area__gutters\"\u003e\n\u003cdiv class=\"ds-scroll-area__horizontal-gutter\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"ds-scroll-area__vertical-gutter\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cspan class=\"\"\u003eBattery Type\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan class=\"\"\u003eSupported Models\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan class=\"\"\u003eVoltage\u003c\/span\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eLi-ion \/ IMR\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e10440, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e3.6V \/ 3.7V \/ 4.35V\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eLiFePO4\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e(All compatible Li-ion sizes above)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e3.2V\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eNi-MH \/ Ni-Cd\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eAA, AAA, AAAA, C, D\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e1.2V\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eDimensions: 152mm × 73mm × 40mm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eWeight: 148.3g\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eApplications:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eEDC flashlights and headlamps\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eDrone and UAV battery systems\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eDIY 12V and 24V battery pack builds\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003ePortable power stations and solar generators\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eHigh-drain remote-controlled models\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eFrequently Asked Questions (FAQ):\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ1: What's the real-world difference between 20A continuous and 35A pulse?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: The 20A rating is the safe, long-term current you can pull without damaging the cell. The 35A rating is what the battery can deliver in short, milliseconds-long bursts—like starting a drone motor. You shouldn't run it at 35A continuously; that would overheat the cell and shorten its life. Treat it as a 20A battery and you'll be fine.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ2: Can I use the UM2 charger with LiFePO4 batteries?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: Yes. The UM2 automatically detects LiFePO4 cells and switches to the correct 3.2V charge profile. No manual setup is required.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ3: What should I do if the charger shows \"EE EE\" on the screen?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: That's the charger's way of saying it found a battery that's been over-discharged or is possibly damaged. The UM2 has a built-in repair mode—just press and hold the \"V\" button to try to revive a deeply drained cell.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ4: Can I charge different battery sizes at the same time?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: Absolutely. The UM2 has two independent slots, so you can charge an 18650 in one slot and a 21700 in the other without any issues. Check the compatibility list above to ensure both sizes are supported.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ5: Can I power the UM2 from a power bank or solar panel?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: Yes. The USB-C input makes it compatible with wall adapters, power banks, car chargers, and even portable solar panels—ideal for field use or road trips.\u003c\/span\u003e\u003c\/p\u003e\n\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Flat Top. For Button Top,\u003ca href=\"https:\/\/oneandes.com\/product\/samsung-25r-2500mah-20a-button-top-battery-2-pack-with-nitecore-um2-smart-charger-high-drain-power-kit-for-vapes-flashlights-and-cordless-tools\/\"\u003e click here\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454220599542,"sku":"OAS1663","price":35.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-um2-samsung-25r-flat-top-2pack-lcd-bundle-main_568cf802-8b83-4c59-afd5-03384457bd2c.webp?v=1786968474"},{"product_id":"samsung-25r-2500mah-20a-button-top-battery-4-pack-with-nitecore-ums4-smart-charger-high-drain-power-kit-with-lcd-control-for-vapes-flashlights-power-tools","title":"Samsung 25R 2500mAh 20A Button Top Battery 4-Pack with Nitecore UMS4 Smart Charger – High-Drain Power Kit with LCD Control for  Flashlights \u0026 Power Tools","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"5:1-5:25;147-171\"\u003eWhat's in This Bundle\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"7:1-9:45;173-308\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"7:1-7:47;173-219\"\u003e4x Samsung INR18650-25R, 2500mAh, Button Top\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"8:1-8:44;220-263\"\u003e1x Nitecore UMS4 4-slot LCD USB-C charger\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"9:1-9:45;264-308\"\u003eCable and manual included with the charger\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"11:1-11:201;310-510\"\u003eA complete kit for anyone running a 4-cell high-drain device or building a small pack — four matched, genuine 25R cells paired with a charger that reports real per-cell health, not just charge status.\u003c\/p\u003e\n\u003cp data-sourcepos=\"11:1-11:201;310-510\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Button Top. Looking for Flat Top? \u003ca href=\"https:\/\/oneandes.com\/product\/samsung-25r-2500mah-20a-flat-top-battery-4-pack-with-nitecore-ums4-smart-charger-high-drain-power-bundle-with-lcd-control-for-edc-lights-drones-custom-packs\/\"\u003eClick here to buy: Samsung INR18650-25R Flat Top + Nitecore UMS4  Bundle.\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"13:1-13:32;512-543\"\u003eWhy This Pairing Makes Sense\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"15:1-15:438;545-982\"\u003eThe 25R is one of the classic high-drain 18650 cells — moderate capacity, a strong 20A continuous discharge rating, and a long track record in mods, RC applications, tools, and custom packs. Four cells bought together as a matched set means consistent capacity and internal resistance across the group, which matters more for a high-drain cell like this one, where mismatched internal resistance between cells shows up faster under load.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"17:1-17:381;984-1364\"\u003eThe Nitecore UMS4 pairs especially well here because it doesn't just charge the cells — it measures and displays internal resistance for each slot with a \"Good\" or \"Poor\" health rating. For a high-drain cell where internal resistance directly affects real-world performance, that's a genuinely useful way to confirm all four cells are actually matched, not just similarly labeled.\u003c\/p\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"19:1-19:31;1366-1396\"\u003eSamsung 25R — Battery Specs\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"21:1-33:21;1398-1865\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eParameter\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eBrand \u0026amp; Model\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSamsung SDI INR18650-25R\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCapacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2,500mAh standard discharge (2,450mAh rated at 10A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFull Charge Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.2V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDischarge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e20A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Charge Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4A (standard charge: 1.25A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eAC Impedance\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e≤18mΩ (1kHz, initial)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eButton Top\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eProtection Circuit\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNone (unprotected cell)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eWeight\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e45g max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"35:1-35:274;1867-2140\"\u003eThis is a genuine high-drain cell, verified against Samsung's official datasheet — not rewrapped or relabeled stock. The 25R is often run close to its current ceiling in real devices, so heat management in your build matters more here than it would with a lower-drain cell.\u003c\/p\u003e\n\u003cp data-sourcepos=\"35:1-35:274;1867-2140\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Button Top. For Flat Top\u003ca href=\"https:\/\/oneandes.com\/product\/samsung-25r-2500mah-20a-flat-top-battery-4-pack-with-nitecore-ums4-smart-charger-high-drain-power-bundle-with-lcd-control-for-edc-lights-drones-custom-packs\/\"\u003e click here\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"37:1-37:33;2142-2174\"\u003eNitecore UMS4 — Charger Specs\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"39:1-51:134;2176-3168\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eParameter\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eInput\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDC 5V⎓2A \/ 12V⎓1.5A, 18W max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eOutput Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.35V \/ 4.2V \/ 3.7V \/ 1.48V (±1%, auto-selected by battery type)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFast Charge Mode\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3000mA×1 \/ 2000mA×2 \/ 1000mA×4 (max)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eStandard Charge Mode\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2000mA×1 \/ 1000mA×2 \/ 500mA×4 (max)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eAdjustable Settings\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge current 300mA-3000mA, charge voltage 3.7V\/4.2V\/4.3V (manual override available)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDisplay\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eBacklit LCD — per-slot voltage, current, charge time, capacity, and internal resistance (mΩ) with Good\/Poor health rating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSpecial Features\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eIMR-optimized charging profile, lithium battery repair function for over-discharged cells, activation for protected cells\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDimensions\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e159mm x 107mm x 41mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eWeight\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e255.4g (charger only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCompatible Cell Sizes\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e10440 through 26700 across Li-ion\/IMR\/LiFePO4, plus Ni-MH\/Ni-Cd (AA\/AAA\/AAAA\/C\/D)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSafety\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eReverse polarity and short-circuit protection (flashing \"EE\" alarm), automatic temperature control, PC fireproof housing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"53:1-53:352;3170-3521\"\u003e\u003cstrong\u003eA realistic note on charge time:\u003c\/strong\u003e with all four slots occupied, the UMS4's fast charge mode delivers roughly 1000mA per slot — well within the 25R's 4A max charge rating, so there's real margin here. Expect a full charge in roughly 2.5-3 hours for all four cells at once, genuinely quick for a 4-slot charger running this many cells simultaneously.\u003c\/p\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"55:1-55:52;3523-3574\"\u003eWhy the Internal Resistance Readout Matters Here\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"57:1-57:467;3576-4042\"\u003eHigh-drain cells like the 25R are exactly where internal resistance differences between cells matter most — a cell with meaningfully higher resistance than its packmates will run hotter and sag more under load, dragging down the performance of a series or parallel pack even if its capacity looks fine on paper. The UMS4's per-slot mΩ readout and health rating let you actually check this instead of assuming four cells from the same order are automatically matched.\u003c\/p\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"59:1-59:33;4044-4076\"\u003eWhere the 25R Actually Shines\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"61:1-64:94;4078-4443\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"62:1-62:90;4155-4244\"\u003e\n\u003cstrong\u003eRC applications\u003c\/strong\u003e — cars, planes, and similar hobbies that need real current delivery\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"63:1-63:105;4245-4349\"\u003e\n\u003cstrong\u003ePower tools and custom packs\u003c\/strong\u003e where discharge capability matters more than maximum runtime per cell\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"64:1-64:94;4350-4443\"\u003e\n\u003cstrong\u003eRobotics and DIY builds\u003c\/strong\u003e needing dependable current under load, verified before assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"66:1-66:154;4445-4598\"\u003eNot the ideal pick if capacity or runtime matters more to you than raw discharge current — a cell like the 30Q or 35E will serve you better in that case.\u003c\/p\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"68:1-68:48;4600-4647\"\u003eThings Worth Knowing Before You Use This Kit\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"70:1-72:188;4649-5190\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"70:1-70:161;4649-4809\"\u003e\n\u003cstrong\u003eThe 25R is an unprotected cell.\u003c\/strong\u003e The charger enforces its own voltage and current cutoffs, but your device still needs to handle discharge-side protection.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"71:1-71:193;4810-5002\"\u003e\n\u003cstrong\u003eDon't mix these cells with older ones you already own\u003c\/strong\u003e, even if they're also 25R — the UMS4's internal resistance readout is exactly the tool for checking this before you combine batches.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"72:1-72:188;5003-5190\"\u003e\n\u003cstrong\u003eThis cell runs warm at its rated ceiling.\u003c\/strong\u003e That's expected behavior for a 20A cell pushed toward that limit, not a defect — but ventilation and enclosure design in your build matter.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"74:1-74:30;5192-5221\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"76:1-77:215;5223-5497\"\u003e\u003cstrong\u003eCan this charger handle the 25R's full capacity safely?\u003c\/strong\u003e Yes. Even at the UMS4's fast charge rate of roughly 1000mA per slot with all four bays occupied, that's comfortably under the 25R's 4A max charge rating — a full charge takes roughly 2.5-3 hours for all four cells.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"79:1-80:274;5499-5829\"\u003e\u003cstrong\u003eWhat does the \"Poor\" health rating actually tell me?\u003c\/strong\u003e It means that cell's measured internal resistance is elevated relative to what's expected for a healthy cell. For a high-drain cell like the 25R, that's worth taking seriously — a \"Poor\" rating suggests the cell may underperform or run hotter than its packmates under load.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"82:1-83:238;5831-6137\"\u003e\u003cstrong\u003eWhy does the 25R run hotter than lower-drain cells like the 35E?\u003c\/strong\u003e It's a direct consequence of the design trade-off — the 25R prioritizes current delivery (20A continuous) over capacity, and pushing more current through a cell generates more heat. This is expected and within the cell's rated tolerance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"85:1-86:135;6139-6327\"\u003e\u003cstrong\u003eCan I charge two different battery sizes at once?\u003c\/strong\u003e Yes — the UMS4's four slots operate independently, so you can mix cell sizes or even Ni-MH\/Ni-Cd batteries across the slots if needed.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"88:1-89:264;6329-6646\"\u003e\u003cstrong\u003eWhat does the lithium battery repair function do?\u003c\/strong\u003e When an over-discharged IMR lithium cell is detected, the display shows an \"EE EE\" prompt; pressing the V button attempts a controlled repair charge. It won't recover every over-discharged cell, but it gives borderline cells a real chance before writing them off.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"93:1-93:209;6653-6861\"\u003e\u003cstrong\u003eIn stock now.\u003c\/strong\u003e This bundle ships as a matched set of four genuine Samsung 25R Button Top cells with a verified Nitecore UMS4 charger — ready for mods, RC, tools, and other high-drain builds out of the box.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454222205174,"sku":"OAS1658","price":87.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ums4-samsung-25r-button-top-4pack-kit-main_b595d61e-aa5a-451e-b76f-fe3699b7fb35.webp?v=1786968526"},{"product_id":"samsung-25r-2500mah-20a-flat-top-battery-4-pack-with-nitecore-ums4-smart-charger-high-drain-power-bundle-with-lcd-control-for-edc-lights-drones-custom-packs","title":"Samsung 25R 2500mAh 20A Flat Top Battery 4-Pack with Nitecore UMS4 Smart Charger – High-Drain Power Bundle with LCD Control for EDC Lights, Drones \u0026 Custom Packs","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"5:1-5:25;145-169\"\u003eWhat's in This Bundle\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"7:1-9:45;171-304\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"7:1-7:45;171-215\"\u003e4x Samsung INR18650-25R, 2500mAh, Flat Top\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"8:1-8:44;216-259\"\u003e1x Nitecore UMS4 4-slot LCD USB-C charger\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"9:1-9:45;260-304\"\u003eCable and manual included with the charger\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"11:1-11:201;306-506\"\u003eA complete kit for anyone running a 4-cell high-drain device or building a small pack — four matched, genuine 25R cells paired with a charger that reports real per-cell health, not just charge status.\u003c\/p\u003e\n\u003cp data-sourcepos=\"11:1-11:201;306-506\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Flat Top. Looking for Button Top? \u003ca href=\"https:\/\/oneandes.com\/product\/samsung-25r-2500mah-20a-button-top-battery-4-pack-with-nitecore-ums4-smart-charger-high-drain-power-kit-with-lcd-control-for-vapes-flashlights-power-tools\/\"\u003eClick here to buy: Samsung INR18650-25R Button Top + Nitecore UMS4 Bundle.\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"13:1-13:32;508-539\"\u003eWhy This Pairing Makes Sense\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"15:1-15:595;541-1135\"\u003eThe 25R is one of the classic high-drain 18650 cells — moderate capacity, a strong 20A continuous discharge rating, and a long track record in mods, RC applications, tools, and custom packs. Four cells bought together as a matched set means consistent capacity and internal resistance across the group, which matters more for a high-drain cell like this one, where mismatched internal resistance between cells shows up faster under load. Flat Top is the standard terminal type for most current devices — DIY packs, tool battery builds, and equipment that doesn't rely on spring-loaded contacts.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"17:1-17:381;1137-1517\"\u003eThe Nitecore UMS4 pairs especially well here because it doesn't just charge the cells — it measures and displays internal resistance for each slot with a \"Good\" or \"Poor\" health rating. For a high-drain cell where internal resistance directly affects real-world performance, that's a genuinely useful way to confirm all four cells are actually matched, not just similarly labeled.\u003c\/p\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"19:1-19:31;1519-1549\"\u003eSamsung 25R — Battery Specs\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"21:1-33:21;1551-2016\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eParameter\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eBrand \u0026amp; Model\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSamsung SDI INR18650-25R\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCapacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2,500mAh standard discharge (2,450mAh rated at 10A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFull Charge Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.2V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDischarge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e20A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Charge Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4A (standard charge: 1.25A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eAC Impedance\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e≤18mΩ (1kHz, initial)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eProtection Circuit\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNone (unprotected cell)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eWeight\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e45g max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"35:1-35:274;2018-2291\"\u003eThis is a genuine high-drain cell, verified against Samsung's official datasheet — not rewrapped or relabeled stock. The 25R is often run close to its current ceiling in real devices, so heat management in your build matters more here than it would with a lower-drain cell.\u003c\/p\u003e\n\u003cp data-sourcepos=\"35:1-35:274;2018-2291\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Flat Top. For Button Top\u003ca href=\"https:\/\/oneandes.com\/product\/samsung-25r-2500mah-20a-button-top-battery-4-pack-with-nitecore-ums4-smart-charger-high-drain-power-kit-with-lcd-control-for-vapes-flashlights-power-tools\/\"\u003e click here\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"37:1-37:33;2293-2325\"\u003eNitecore UMS4 — Charger Specs\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"39:1-51:134;2327-3319\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eParameter\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eInput\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDC 5V⎓2A \/ 12V⎓1.5A, 18W max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eOutput Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.35V \/ 4.2V \/ 3.7V \/ 1.48V (±1%, auto-selected by battery type)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFast Charge Mode\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3000mA×1 \/ 2000mA×2 \/ 1000mA×4 (max)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eStandard Charge Mode\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2000mA×1 \/ 1000mA×2 \/ 500mA×4 (max)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eAdjustable Settings\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge current 300mA-3000mA, charge voltage 3.7V\/4.2V\/4.3V (manual override available)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDisplay\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eBacklit LCD — per-slot voltage, current, charge time, capacity, and internal resistance (mΩ) with Good\/Poor health rating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSpecial Features\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eIMR-optimized charging profile, lithium battery repair function for over-discharged cells, activation for protected cells\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDimensions\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e159mm x 107mm x 41mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eWeight\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e255.4g (charger only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCompatible Cell Sizes\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e10440 through 26700 across Li-ion\/IMR\/LiFePO4, plus Ni-MH\/Ni-Cd (AA\/AAA\/AAAA\/C\/D)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSafety\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eReverse polarity and short-circuit protection (flashing \"EE\" alarm), automatic temperature control, PC fireproof housing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"53:1-53:352;3321-3672\"\u003e\u003cstrong\u003eA realistic note on charge time:\u003c\/strong\u003e with all four slots occupied, the UMS4's fast charge mode delivers roughly 1000mA per slot — well within the 25R's 4A max charge rating, so there's real margin here. Expect a full charge in roughly 2.5-3 hours for all four cells at once, genuinely quick for a 4-slot charger running this many cells simultaneously.\u003c\/p\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"55:1-55:52;3674-3725\"\u003eWhy the Internal Resistance Readout Matters Here\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"57:1-57:467;3727-4193\"\u003eHigh-drain cells like the 25R are exactly where internal resistance differences between cells matter most — a cell with meaningfully higher resistance than its packmates will run hotter and sag more under load, dragging down the performance of a series or parallel pack even if its capacity looks fine on paper. The UMS4's per-slot mΩ readout and health rating let you actually check this instead of assuming four cells from the same order are automatically matched.\u003c\/p\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"59:1-59:33;4195-4227\"\u003eWhere the 25R Actually Shines\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"61:1-64:94;4229-4594\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"62:1-62:90;4306-4395\"\u003e\n\u003cstrong\u003eRC applications\u003c\/strong\u003e — cars, planes, and similar hobbies that need real current delivery\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"63:1-63:105;4396-4500\"\u003e\n\u003cstrong\u003ePower tools and custom packs\u003c\/strong\u003e where discharge capability matters more than maximum runtime per cell\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"64:1-64:94;4501-4594\"\u003e\n\u003cstrong\u003eRobotics and DIY builds\u003c\/strong\u003e needing dependable current under load, verified before assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"66:1-66:154;4596-4749\"\u003eNot the ideal pick if capacity or runtime matters more to you than raw discharge current — a cell like the 30Q or 35E will serve you better in that case.\u003c\/p\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"68:1-68:48;4751-4798\"\u003eThings Worth Knowing Before You Use This Kit\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"70:1-73:188;4800-5528\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"70:1-70:161;4800-4960\"\u003e\n\u003cstrong\u003eThe 25R is an unprotected cell.\u003c\/strong\u003e The charger enforces its own voltage and current cutoffs, but your device still needs to handle discharge-side protection.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"71:1-71:193;4961-5153\"\u003e\n\u003cstrong\u003eDon't mix these cells with older ones you already own\u003c\/strong\u003e, even if they're also 25R — the UMS4's internal resistance readout is exactly the tool for checking this before you combine batches.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"72:1-72:187;5154-5340\"\u003e\n\u003cstrong\u003eFlat Top won't work in devices that specifically require Button Top cells\u003c\/strong\u003e — check your device's battery compartment before ordering if you're not sure which terminal type it needs.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"73:1-73:188;5341-5528\"\u003e\n\u003cstrong\u003eThis cell runs warm at its rated ceiling.\u003c\/strong\u003e That's expected behavior for a 20A cell pushed toward that limit, not a defect — but ventilation and enclosure design in your build matter.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"75:1-75:30;5530-5559\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"77:1-78:215;5561-5835\"\u003e\u003cstrong\u003eCan this charger handle the 25R's full capacity safely?\u003c\/strong\u003e Yes. Even at the UMS4's fast charge rate of roughly 1000mA per slot with all four bays occupied, that's comfortably under the 25R's 4A max charge rating — a full charge takes roughly 2.5-3 hours for all four cells.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"80:1-81:274;5837-6167\"\u003e\u003cstrong\u003eWhat does the \"Poor\" health rating actually tell me?\u003c\/strong\u003e It means that cell's measured internal resistance is elevated relative to what's expected for a healthy cell. For a high-drain cell like the 25R, that's worth taking seriously — a \"Poor\" rating suggests the cell may underperform or run hotter than its packmates under load.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"83:1-84:261;6169-6472\"\u003e\u003cstrong\u003eWill Flat Top cells work in my device?\u003c\/strong\u003e If your device uses spring-loaded, flat, or magnetic-style contacts without a raised positive terminal requirement, Flat Top is the correct choice. If your device specifically calls for Button Top (a raised positive terminal), you'll want that version instead.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"86:1-87:135;6474-6662\"\u003e\u003cstrong\u003eCan I charge two different battery sizes at once?\u003c\/strong\u003e Yes — the UMS4's four slots operate independently, so you can mix cell sizes or even Ni-MH\/Ni-Cd batteries across the slots if needed.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"89:1-90:264;6664-6981\"\u003e\u003cstrong\u003eWhat does the lithium battery repair function do?\u003c\/strong\u003e When an over-discharged IMR lithium cell is detected, the display shows an \"EE EE\" prompt; pressing the V button attempts a controlled repair charge. It won't recover every over-discharged cell, but it gives borderline cells a real chance before writing them off.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"94:1-94:207;6988-7194\"\u003e\u003cstrong\u003eIn stock now.\u003c\/strong\u003e This bundle ships as a matched set of four genuine Samsung 25R Flat Top cells with a verified Nitecore UMS4 charger — ready for mods, RC, tools, and other high-drain builds out of the box.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454222270710,"sku":"OAS1664","price":87.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ums4-samsung-25r-flat-top-4pack-bundle-main_d1b987e8-a304-41dc-a673-de04ea395534.webp?v=1786968526"},{"product_id":"nitecore-ui2-usb-c-dual-slot-portable-li-ion-battery-charger-smart-cc-cv-charging-compatible-with-20700-21700","title":"NITECORE UI2 USB-C Dual-Slot Portable Li-ion Battery Charger | Smart CC\/CV Charging, Compatible with 20700\/21700","description":"\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"19:1-19:52;1018-1069\"\u003eUSB-C Dual-Slot Portable Li-ion Battery Charger\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"21:1-21:90;1071-1160\"\u003eBroad Compatibility · Smart CC\/CV Charging · 1000mA per Bay · Multiple Safety Protections\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"25:1-25:28;1167-1194\"\u003eKey Features at a Glance\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"27:1-36:117;1196-2267\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eFeature\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eDescription\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eUSB-C Input\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCompatible with any 5V power bank, solar panel, or USB adapter — charge anywhere, anytime\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eAutomatic CC\/CV Charging Mode\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eIntelligently selects the most suitable charging mode (constant current \/ constant voltage)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eIndependent Dual-Bay Control\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eEach of the 2 bays charges independently without affecting the other\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTrickle Charging\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eAutomatically switches to trickle mode when battery voltage is below 2.9V, protecting the battery and extending its lifespan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eOver-Discharge Battery Activation\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eAutomatically detects and reactivates batteries that have over-discharged due to storage or improper use (for protected Li-ion cells)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMultiple Safety Protections\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eReverse-polarity\/short-circuit protection, intelligent temperature control, and overcharge protection — four layers of safety\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eLightweight \u0026amp; Portable\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eJust 79.5g, 125.5 × 59.5 × 32.1mm — easy to carry anywhere outdoors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFire-Retardant Housing\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eBuilt with PC fire-retardant material to handle demanding outdoor charging environments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"40:1-40:54;2274-2327\"\u003eBroad Compatibility for 3.6V\/3.7V Li-ion Batteries\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"42:1-42:76;2329-2404\"\u003e\u003cstrong\u003eCharges 20700 and 21700 cells\u003c\/strong\u003e, along with the following battery models:\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"44:1-44:225;2406-2630\"\u003e10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"48:1-48:33;2637-2669\"\u003eAutomatic CC\/CV Charging Mode\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"50:1-50:197;2671-2867\"\u003eThe UI2 intelligently selects the most suitable charging mode for each battery, switching flexibly between constant current and constant voltage to balance charging efficiency with battery safety.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"54:1-54:24;2874-2897\"\u003eUp to 1000mA per Bay\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"56:1-56:86;2899-2984\"\u003eSupports trickle charging to effectively protect batteries and extend their lifespan.\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"58:1-59:142;2986-3253\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"58:1-58:126;2986-3111\"\u003eWhen a battery with voltage \u003cstrong\u003ebelow 2.9V\u003c\/strong\u003e is inserted, the charger automatically enters trickle charging mode at \u003cstrong\u003e100mA\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"59:1-59:142;3112-3253\"\u003eWhen a battery with voltage \u003cstrong\u003eabove 2.9V\u003c\/strong\u003e is inserted, the charger switches to standard charging mode with a maximum current of \u003cstrong\u003e1000mA\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"63:1-63:30;3260-3289\"\u003eClear Charge-Level Display\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"65:1-65:108;3291-3398\"\u003eBuilt-in indicator lights let you check battery charge level and charging status at a glance, in real time.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"69:1-69:37;3405-3441\"\u003eOver-Discharge Battery Activation\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"71:1-72:52;3443-3652\"\u003eIf a battery has over-discharged due to storage or improper use, the UI2 automatically detects and reactivates it, bringing \"dormant\" batteries back to life. \u003cem\u003e(This feature applies to protected Li-ion cells.)\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"76:1-76:42;3659-3700\"\u003eMultiple Protections for Safe Charging\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"78:1-80:133;3702-4158\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"78:1-78:146;3702-3847\"\u003e\n\u003cstrong\u003eReverse-Polarity \u0026amp; Short-Circuit Protection\u003c\/strong\u003e: If a battery fault or short circuit occurs, all three indicator lights flash to alert the user\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"79:1-79:178;3848-4025\"\u003e\n\u003cstrong\u003eFully Automatic Intelligent Temperature Control\u003c\/strong\u003e: When ambient temperature rises too high, the UI2 automatically adjusts current to protect both the charger and the battery\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"80:1-80:133;4026-4158\"\u003e\n\u003cstrong\u003eOvercharge Protection\u003c\/strong\u003e: When a battery is fully charged, all three indicator lights turn solid and charging automatically stops\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"84:1-84:41;4165-4205\"\u003eBuilt with PC Fire-Retardant Material\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"86:1-86:110;4207-4316\"\u003ePremium materials ensure safety, letting you charge confidently in complex and variable outdoor environments.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"90:1-90:31;4323-4353\"\u003eCertified for Peace of Mind\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"92:1-92:45;4355-4399\"\u003eCE and FCC certified for guaranteed quality.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"96:1-96:43;4406-4448\"\u003eLightweight \u0026amp; Portable, Charge Anywhere\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"98:1-99:20;4450-4513\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"98:1-98:44;4450-4493\"\u003e\n\u003cstrong\u003eDimensions\u003c\/strong\u003e: 125.5mm × 59.5mm × 32.1mm\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"99:1-99:20;4494-4513\"\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 79.5g\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"101:1-101:96;4515-4610\"\u003eCompact and lightweight — slips easily into a backpack or pocket for hassle-free outdoor carry.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"105:1-105:18;4617-4634\"\u003eSpecifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"107:1-115:19;4636-5092\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eUI2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eInput\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDC 5V\/2A 10W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eOutput Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.2V±1%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eOutput Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e1000mA×2 (max)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCompatible Batteries\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eLi-ion\/IMR: 10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDimensions\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e125.5mm × 59.5mm × 32.1mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eWeight\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e79.5g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eFAQ\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ1: Which battery types are compatible with the NITECORE UI2?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: The NITECORE UI2 offers broad compatibility for all 3.6V\/3.7V Li-ion and IMR batteries. Supported sizes include: 10440, 14500, 16340 (RCR123), 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650, and more.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ2: Does it use a USB-C port, and how can I power it?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: Yes, the UI2 features a standard USB-C input. It can be powered by any 5V\/2A (10W) USB wall adapter, power bank, solar panel, or car USB port. This makes it incredibly portable and perfect for outdoor or travel charging.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ3: What is the charging speed? Can both slots charge at max speed simultaneously?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: The UI2 provides a maximum output of 1000mA (1A) per slot. The two bays are \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003efully independent\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e, meaning both bays can charge simultaneously at up to 1A without affecting each other. If a battery voltage is below 2.9V, it will automatically enter a 100mA trickle charge mode to protect the cell.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ4: Can the UI2 revive over-discharged batteries?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: Yes, in most cases. The UI2 features an over-discharge battery activation function. When it detects a battery that has been over-discharged due to long-term storage or improper use, it automatically attempts to reactivate the cell. \u003c\/span\u003e\u003cem\u003e\u003cspan class=\"\"\u003e(Note: This applies to protected Li-ion cells).\u003c\/span\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ5: How do I know when the battery is fully charged?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: The UI2 features a clear LED indicator. When the battery is charging, the light will flash. Once the battery reaches the full 4.2V charge, the indicator light will \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003estay solid (stop flashing)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e, and the charger will automatically stop charging to prevent overcharging.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e        Important Safety Notice:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eAlways use a 5V\/2A or higher USB power adapter for optimal performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eDo not attempt to charge non-rechargeable batteries (e.g., alkaline) or damaged batteries that cannot be activated below 2.9V.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eDuring charging, place the charger in a well-ventilated area, away from high temperatures and flammable materials.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454222827766,"sku":"OAS1360","price":18.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ui2-dual-slot-usb-c-charger-main_c1f452a9-0277-45ce-976c-6ed2d8572109.webp?v=1786968551"},{"product_id":"nitecore-ui2-usb-c-dual-slot-charger-2x-samsung-25r-button-top-18650-battery-kit","title":"NITECORE UI2 USB-C Dual-Slot Charger \u0026 2x Samsung 25R Button Top 18650 Battery Kit","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;164-182\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:389;184-572\"\u003eHigh-drain batteries perform best with a charger built to match their charging profile. This bundle pairs genuine Samsung 25R Button Top cells with the NITECORE UI2 — a compact, USB-C powered charger that automatically selects the right charging mode and includes trickle charging and over-discharge protection. Everything you need to charge and maintain your cells, ready out of the box.\u003c\/p\u003e\n\u003cp data-sourcepos=\"8:1-8:389;184-572\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Button Top. Looking for Flat Top? \u003ca href=\"https:\/\/oneandes.com\/product\/nitecore-ui2-usb-c-dual-slot-charger-2x-samsung-25r-flat-top-18650-battery-kit\/\"\u003eClick here to buy: Samsung INR18650-25R Flat Top + NITECORE UI2 Bundle.\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:52;579-630\"\u003eSamsung INR18650-25R (Button Top) Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-24:120;632-1168\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSamsung INR18650-25R (Button Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eRated Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2500mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e20A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.2V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNMC (Lithium Nickel Manganese Cobalt Oxide)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e18650 (approx.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eΦ18.4mm × 65.3mm)\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eButton Top — positive terminal has a raised nub, suited for devices requiring point contact\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eHigh-output flashlights, power tools, DIY battery packs, and other high-drain applications\u003c\/td\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"26:1-26:201;1170-1370\"\u003e\u003cem\u003eNote: High-drain cells demand careful handling — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"30:1-30:29;1377-1405\"\u003eThe Charger: NITECORE UI2\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"32:1-38:69;1407-2182\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"32:1-32:113;1407-1519\"\u003e\n\u003cstrong\u003eUSB-C input\u003c\/strong\u003e: charge from any 5V power bank, solar panel, or USB adapter — great for travel and outdoor use\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"33:1-33:100;1520-1619\"\u003e\n\u003cstrong\u003eAutomatic CC\/CV Charging\u003c\/strong\u003e: intelligently selects the most suitable charging mode for each cell\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"34:1-34:105;1620-1724\"\u003e\n\u003cstrong\u003eIndependent Dual-Bay Control\u003c\/strong\u003e: each of the 2 bays charges independently without affecting the other\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"35:1-35:142;1725-1866\"\u003e\n\u003cstrong\u003eTrickle Charging\u003c\/strong\u003e: automatically switches to 100mA trickle mode for batteries below 2.9V, then up to 1000mA standard charging above 2.9V\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"36:1-36:110;1867-1976\"\u003e\n\u003cstrong\u003eOver-Discharge Activation\u003c\/strong\u003e: automatically detects and reactivates over-discharged protected Li-ion cells\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"37:1-37:137;1977-2113\"\u003e\n\u003cstrong\u003eMultiple Safety Protections\u003c\/strong\u003e: reverse-polarity\/short-circuit protection, intelligent temperature control, and overcharge protection\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"38:1-38:69;2114-2182\"\u003e\n\u003cstrong\u003eUltra-Compact \u0026amp; Lightweight\u003c\/strong\u003e: just 79.5g, 125.5 × 59.5 × 32.1mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"42:1-42:52;2189-2240\"\u003eNITECORE UI2 – Supported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"44:1-44:94;2242-2335\"\u003e\u003cstrong\u003eCharges 3.6V\/3.7V Li-ion\/IMR batteries\u003c\/strong\u003e, including the Samsung 25R (18650) in this bundle:\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"46:1-46:225;2337-2561\"\u003e10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"48:1-49:69;2563-2659\"\u003e\u003cstrong\u003eOutput voltage:\u003c\/strong\u003e 4.2V±1% \u003cstrong\u003eOutput current:\u003c\/strong\u003e up to 1000mA per bay (max 2 bays simultaneously)\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"53:1-53:23;2666-2688\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"55:1-55:225;2690-2914\"\u003eThe UI2's charging bays are open-ended, allowing both Button Top and Flat Top batteries to seat properly without any adapter. Samsung 25R Button Top cells measure about 65.3mm, well within the UI2's compatible battery range.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"59:1-59:19;2921-2939\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"61:1-64:18;2941-3058\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"61:1-61:46;2941-2986\"\u003eSamsung INR18650-25R Button Top Battery × 2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"62:1-62:27;2987-3013\"\u003eNITECORE UI2 Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"63:1-63:27;3014-3040\"\u003eUSB-C Charging Cable × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"64:1-64:18;3041-3058\"\u003eUser Manual × 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Button Top. For Flat Top\u003ca href=\"https:\/\/oneandes.com\/product\/nitecore-ui2-usb-c-dual-slot-charger-2x-samsung-25r-flat-top-18650-battery-kit\/\"\u003e click here\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"68:1-68:15;3065-3079\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"70:1-73:132;3081-3454\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"70:1-70:105;3081-3185\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"71:1-71:63;3186-3248\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"72:1-72:74;3249-3322\"\u003eCharge only with a genuine, compatible charger such as the NITECORE UI2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"73:1-73:132;3323-3454\"\u003eThese are high-drain cells intended for compatible, purpose-built devices — do not use them in unauthorized or modified equipment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"77:1-77:7;3461-3467\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"79:1-80:157;3469-3701\"\u003e\u003cstrong\u003eQ: Can the NITECORE UI2 charge Samsung 25R Button Top batteries safely?\u003c\/strong\u003e A: Yes. The UI2 automatically selects the optimal CC\/CV charging mode for Li-ion cells like the 25R, with a 4.2V±1% output voltage and up to 1000mA per bay.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"82:1-83:188;3703-3962\"\u003e\u003cstrong\u003eQ: What's the difference between Button Top and Flat Top batteries?\u003c\/strong\u003e A: The only difference is the shape of the positive terminal — Button Top has a raised nub for point contact, while Flat Top is level. Capacity, voltage, and discharge rate are identical.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"85:1-86:104;3964-4138\"\u003e\u003cstrong\u003eQ: Do I need an adapter to charge Button Top batteries in the UI2?\u003c\/strong\u003e A: No. The UI2's open charging bays accommodate both Button Top and Flat Top cells without any adapter.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"88:1-89:131;4140-4323\"\u003e\u003cstrong\u003eQ: Can I charge both batteries at the same time?\u003c\/strong\u003e A: Yes. The UI2 has 2 independent bays, each capable of up to 1000mA, and one battery's charging status does not affect the other.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"91:1-92:130;4325-4516\"\u003e\u003cstrong\u003eQ: Can I power the UI2 with a power bank while traveling?\u003c\/strong\u003e A: Yes. The UI2 has a USB-C input and works with any 5V power source, including power banks, solar panels, and USB wall adapters.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"94:1-95:179;4518-4750\"\u003e\u003cstrong\u003eQ: What happens if a battery has over-discharged?\u003c\/strong\u003e A: The UI2 includes an over-discharge activation feature that automatically detects and reactivates protected Li-ion cells that have dropped too low from storage or improper use.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"97:1-98:219;4752-5032\"\u003e\u003cstrong\u003eQ: Is 20A continuous discharge safe for everyday devices?\u003c\/strong\u003e A: These are high-drain cells built for devices that specifically call for high continuous discharge, such as certain flashlights, and power tools. Always check your device's battery requirements before use.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"100:1-101:115;5034-5174\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 2 Samsung INR18650-25R Button Top batteries, 1 NITECORE UI2 charger, a USB-C charging cable, and a user manual.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454222860534,"sku":"OAS1656","price":22.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ui2-samsung-25r-button-top-2pack-kit-main_400938c6-a3b7-4644-a536-e181681f743a.webp?v=1786968550"},{"product_id":"nitecore-ui2-usb-c-dual-slot-charger-2x-samsung-25r-flat-top-18650-battery-kit","title":"NITECORE UI2 USB-C Dual-Slot Charger \u0026 2x Samsung 25R Flat Top 18650 Battery Kit","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;162-180\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:387;182-568\"\u003eHigh-drain batteries perform best with a charger built to match their charging profile. This bundle pairs genuine Samsung 25R Flat Top cells with the NITECORE UI2 — a compact, USB-C powered charger that automatically selects the right charging mode and includes trickle charging and over-discharge protection. Everything you need to charge and maintain your cells, ready out of the box.\u003c\/p\u003e\n\u003cp data-sourcepos=\"8:1-8:387;182-568\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Flat Top. Looking for Button Top? \u003ca href=\"https:\/\/oneandes.com\/product\/nitecore-ui2-usb-c-dual-slot-charger-2x-samsung-25r-button-top-18650-battery-kit\/\"\u003eClick here to buy: Samsung INR18650-25R Button Top + NITECORE UI2  Bundle.\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:50;575-624\"\u003eSamsung INR18650-25R (Flat Top) Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-24:127;626-1161\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSamsung INR18650-25R (Flat Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eRated Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2500mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e20A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.2V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNMC (Lithium Nickel Manganese Cobalt Oxide)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e18650 (approx. Φ18.3mm × 65.0mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top — level positive terminal, suited for devices requiring full-surface contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eBattery packs, power banks, flashlights, power tools, e-bikes, and other devices designed for flat-top cells\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"26:1-26:201;1163-1363\"\u003e\u003cem\u003eNote: High-drain cells demand careful handling — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"30:1-30:29;1370-1398\"\u003eThe Charger: NITECORE UI2\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"32:1-38:69;1400-2175\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"32:1-32:113;1400-1512\"\u003e\n\u003cstrong\u003eUSB-C input\u003c\/strong\u003e: charge from any 5V power bank, solar panel, or USB adapter — great for travel and outdoor use\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"33:1-33:100;1513-1612\"\u003e\n\u003cstrong\u003eAutomatic CC\/CV Charging\u003c\/strong\u003e: intelligently selects the most suitable charging mode for each cell\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"34:1-34:105;1613-1717\"\u003e\n\u003cstrong\u003eIndependent Dual-Bay Control\u003c\/strong\u003e: each of the 2 bays charges independently without affecting the other\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"35:1-35:142;1718-1859\"\u003e\n\u003cstrong\u003eTrickle Charging\u003c\/strong\u003e: automatically switches to 100mA trickle mode for batteries below 2.9V, then up to 1000mA standard charging above 2.9V\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"36:1-36:110;1860-1969\"\u003e\n\u003cstrong\u003eOver-Discharge Activation\u003c\/strong\u003e: automatically detects and reactivates over-discharged protected Li-ion cells\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"37:1-37:137;1970-2106\"\u003e\n\u003cstrong\u003eMultiple Safety Protections\u003c\/strong\u003e: reverse-polarity\/short-circuit protection, intelligent temperature control, and overcharge protection\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"38:1-38:69;2107-2175\"\u003e\n\u003cstrong\u003eUltra-Compact \u0026amp; Lightweight\u003c\/strong\u003e: just 79.5g, 125.5 × 59.5 × 32.1mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"42:1-42:52;2182-2233\"\u003eNITECORE UI2 – Supported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"44:1-44:94;2235-2328\"\u003e\u003cstrong\u003eCharges 3.6V\/3.7V Li-ion\/IMR batteries\u003c\/strong\u003e, including the Samsung 25R (18650) in this bundle:\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"46:1-46:225;2330-2554\"\u003e10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"48:1-49:69;2556-2652\"\u003e\u003cstrong\u003eOutput voltage:\u003c\/strong\u003e 4.2V±1% \u003cstrong\u003eOutput current:\u003c\/strong\u003e up to 1000mA per bay (max 2 bays simultaneously)\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"53:1-53:23;2659-2681\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"55:1-55:203;2683-2885\"\u003eThe UI2's charging bays are open-ended, allowing Flat Top batteries to seat securely without any adapter. Samsung 25R Flat Top cells measure about 65.0mm, well within the UI2's compatible battery range.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"59:1-59:19;2892-2910\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"61:1-64:18;2912-3027\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"61:1-61:44;2912-2955\"\u003eSamsung INR18650-25R Flat Top Battery × 2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"62:1-62:27;2956-2982\"\u003eNITECORE UI2 Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"63:1-63:27;2983-3009\"\u003eUSB-C Charging Cable × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"64:1-64:18;3010-3027\"\u003eUser Manual × 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Flat Top. For Button Top\u003ca href=\"https:\/\/oneandes.com\/product\/nitecore-ui2-usb-c-dual-slot-charger-2x-samsung-25r-button-top-18650-battery-kit\/\"\u003e click here\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"68:1-68:15;3034-3048\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"70:1-74:187;3050-3610\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"70:1-70:105;3050-3154\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"71:1-71:63;3155-3217\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"72:1-72:74;3218-3291\"\u003eCharge only with a genuine, compatible charger such as the NITECORE UI2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"73:1-73:132;3292-3423\"\u003eThese are high-drain cells intended for compatible, purpose-built devices — do not use them in unauthorized or modified equipment\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"74:1-74:187;3424-3610\"\u003eFlat Top batteries are commonly used in devices with spring or flat-contact battery holders (e.g., battery packs and power tools) — check your device's terminal requirements before use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"78:1-78:7;3617-3623\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"80:1-81:157;3625-3855\"\u003e\u003cstrong\u003eQ: Can the NITECORE UI2 charge Samsung 25R Flat Top batteries safely?\u003c\/strong\u003e A: Yes. The UI2 automatically selects the optimal CC\/CV charging mode for Li-ion cells like the 25R, with a 4.2V±1% output voltage and up to 1000mA per bay.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"83:1-84:195;3857-4123\"\u003e\u003cstrong\u003eQ: What's the difference between Flat Top and Button Top batteries?\u003c\/strong\u003e A: The only difference is the shape of the positive terminal — Flat Top is level for full-surface contact, while Button Top has a raised nub. Capacity, voltage, and discharge rate are identical.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"86:1-87:137;4125-4330\"\u003e\u003cstrong\u003eQ: Will Flat Top batteries sit properly in the UI2 charger bays?\u003c\/strong\u003e A: Yes. The UI2's open charging bays are designed to accommodate both Flat Top and Button Top cells without any adapter or modification.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"89:1-90:131;4332-4515\"\u003e\u003cstrong\u003eQ: Can I charge both batteries at the same time?\u003c\/strong\u003e A: Yes. The UI2 has 2 independent bays, each capable of up to 1000mA, and one battery's charging status does not affect the other.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"92:1-93:130;4517-4708\"\u003e\u003cstrong\u003eQ: Can I power the UI2 with a power bank while traveling?\u003c\/strong\u003e A: Yes. The UI2 has a USB-C input and works with any 5V power source, including power banks, solar panels, and USB wall adapters.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"95:1-96:179;4710-4942\"\u003e\u003cstrong\u003eQ: What happens if a battery has over-discharged?\u003c\/strong\u003e A: The UI2 includes an over-discharge activation feature that automatically detects and reactivates protected Li-ion cells that have dropped too low from storage or improper use.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"98:1-99:227;4944-5232\"\u003e\u003cstrong\u003eQ: Is 20A continuous discharge safe for everyday devices?\u003c\/strong\u003e A: These are high-drain cells built for devices that specifically call for high continuous discharge, such as certain power tools, flashlights, and DIY battery packs. Always check your device's battery requirements before use.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"101:1-102:113;5234-5372\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 2 Samsung INR18650-25R Flat Top batteries, 1 NITECORE UI2 charger, a USB-C charging cable, and a user manual.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454222893302,"sku":"OAS1662","price":22.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ui2-samsung-25r-flat-top-2pack-kit-main_613dd197-1efe-4acc-bade-d410a2d068f5.webp?v=1786968557"},{"product_id":"nitecore-ui1-type-c-single-slot-portable-li-ion-battery-charger-smart-cc-cv-charging-compatible-with-20700-21700","title":"NITECORE UI1 Type-C Single-Slot Portable Li-ion Battery Charger | Smart CC\/CV Charging, Compatible with 20700\/21700","description":"\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"19:1-19:55;1034-1088\"\u003eType-C Single-Slot Portable Li-ion Battery Charger\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"21:1-21:84;1090-1173\"\u003eBroad Compatibility · Smart CC\/CV Charging · Up to 1000mA · 40.5g Ultra-Lightweight\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"25:1-25:28;1180-1207\"\u003eKey Features at a Glance\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"27:1-36:73;1209-2243\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eFeature\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eDescription\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eType-C Input\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eAutomatically adapts to the optimal charging mode — a single universal cable is all you need on the go\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eAutomatic CC\/CV Charging Mode\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eIntelligently selects the most suitable charging mode (constant current \/ constant voltage)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eUp to 1000mA Charging Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSupports trickle charging to effectively protect batteries and extend their lifespan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eOver-Discharge Battery Activation\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eAutomatically detects and reactivates batteries that have over-discharged due to storage or improper use (for protected Li-ion cells)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMultiple Safety Protections\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eReverse-polarity\/short-circuit protection, intelligent temperature control, and overcharge protection — four layers of safety\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eLightweight \u0026amp; Portable\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eJust 40.5g, 122.5 × 29.2 × 32mm — fits comfortably in one hand or a pocket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFire-Retardant Housing\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eBuilt with PC fire-retardant material to handle demanding outdoor charging environments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMulti-Certified\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCE, RoHS, and FCC certified for guaranteed quality\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"40:1-40:54;2250-2303\"\u003eBroad Compatibility for 3.6V\/3.7V Li-ion Batteries\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"42:1-42:76;2305-2380\"\u003e\u003cstrong\u003eCharges 20700 and 21700 cells\u003c\/strong\u003e, along with the following battery models:\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"44:1-44:225;2382-2606\"\u003e10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"48:1-48:33;2613-2645\"\u003eAutomatic CC\/CV Charging Mode\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"50:1-50:197;2647-2843\"\u003eThe UI1 intelligently selects the most suitable charging mode for each battery, switching flexibly between constant current and constant voltage to balance charging efficiency with battery safety.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"54:1-54:33;2850-2882\"\u003eUp to 1000mA Charging Current\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"56:1-56:130;2884-3013\"\u003eSupports trickle charging to effectively protect batteries and extend their lifespan, giving you peace of mind with every charge.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"60:1-60:30;3020-3049\"\u003eClear Charge-Level Display\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"62:1-62:108;3051-3158\"\u003eBuilt-in indicator lights let you check battery charge level and charging status at a glance, in real time.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"66:1-66:37;3165-3201\"\u003eOver-Discharge Battery Activation\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"68:1-69:52;3203-3412\"\u003eIf a battery has over-discharged due to storage or improper use, the UI1 automatically detects and reactivates it, bringing \"dormant\" batteries back to life. \u003cem\u003e(This feature applies to protected Li-ion cells.)\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"73:1-73:42;3419-3460\"\u003eMultiple Protections for Safe Charging\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"75:1-77:133;3462-3918\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"75:1-75:146;3462-3607\"\u003e\n\u003cstrong\u003eReverse-Polarity \u0026amp; Short-Circuit Protection\u003c\/strong\u003e: If a battery fault or short circuit occurs, all three indicator lights flash to alert the user\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"76:1-76:178;3608-3785\"\u003e\n\u003cstrong\u003eFully Automatic Intelligent Temperature Control\u003c\/strong\u003e: When ambient temperature rises too high, the UI1 automatically adjusts current to protect both the charger and the battery\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"77:1-77:133;3786-3918\"\u003e\n\u003cstrong\u003eOvercharge Protection\u003c\/strong\u003e: When a battery is fully charged, all three indicator lights turn solid and charging automatically stops\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"81:1-81:41;3925-3965\"\u003eBuilt with PC Fire-Retardant Material\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"83:1-83:110;3967-4076\"\u003ePremium materials ensure safety, letting you charge confidently in complex and variable outdoor environments.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"87:1-87:31;4083-4113\"\u003eCertified for Peace of Mind\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"89:1-89:52;4115-4166\"\u003eCE, RoHS, and FCC certified for guaranteed quality.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"93:1-93:43;4173-4215\"\u003eLightweight \u0026amp; Portable, Charge Anywhere\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"95:1-96:20;4217-4278\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"95:1-95:42;4217-4258\"\u003e\n\u003cstrong\u003eDimensions\u003c\/strong\u003e: 122.5mm × 29.2mm × 32mm\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"96:1-96:20;4259-4278\"\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 40.5g\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"98:1-98:127;4280-4406\"\u003eThe single-slot design keeps it extra compact — slip it into a pocket for effortless outdoor adventures or everyday commuting.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"102:1-102:18;4413-4430\"\u003eSpecifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"104:1-112:19;4432-4897\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eUI1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eInput\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDC 5V\/1A 5W (Type-C port)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eOutput Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.2V±1%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eOutput Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e1000mA (max)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCompatible Batteries\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eLi-ion\/IMR: 10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDimensions\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e122.5mm × 29.2mm × 32mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eWeight\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e40.5g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eFAQ \u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ1: Which battery types are compatible with the NITECORE UI1?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: The UI1 offers broad compatibility for all 3.6V\/3.7V Li-ion and IMR batteries. It supports numerous sizes, including but not limited to: 10440, 14500, 16340 (RCR123), 18350, 18490, 18500, 18650, 20700, 21700, 22650, 26650, and more.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ2: Does it use a Type-C port? What are the power requirements?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: Yes, the UI1 features a standard \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eType-C input port\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e. You can power it directly using a standard phone charger, power bank, or car USB port with an input of DC 5V\/1A (5W) or higher. No extra chargers are needed when you're on the go.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ3: What is the charging speed? Why is it limited to 1000mA?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: The UI1 provides a maximum output current of 1000mA (1A) per slot. This is perfectly sufficient and safe for single-cell charging. Notably, when a battery voltage drops below 2.9V, it automatically activates a 100mA trickle charge mode to safely \"wake up\" the battery, effectively extending its lifespan.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ4: Can it really revive batteries that have been sitting unused for a long time?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: Yes. The UI1 features an \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eover-discharge battery activation\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e function. When it detects a protected Li-ion cell that has over-discharged (below 2.9V) due to long-term storage or improper use, it automatically attempts to reactivate the \"dormant\" battery with a low current.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ5: Is this charger safe to use even though it's so small and lightweight?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: Absolutely. Despite weighing only 40.5g, the UI1 features a \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003ePC fire-retardant housing\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e and \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003equadruple safety protections\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e, including: 1) Reverse-polarity and short-circuit protection with an alert indicator, 2) Intelligent temperature control, 3) Automatic overcharge cut-off. It is also CE, RoHS, and FCC certified for peace of mind.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e      Important Safety Notice:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eNever attempt to charge non-rechargeable batteries (e.g., alkaline batteries).\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eAlways use a USB power adapter with an output of 5V\/1A or higher.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eEnsure proper ventilation during charging; avoid use in extreme high-temperature environments.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454222926070,"sku":"OAS1359","price":14.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ui1-single-slot-usb-c-charger-main_f8525e57-1f6c-47f8-8832-387bfc7d7b3e.webp?v=1786968563"},{"product_id":"nitecore-ums4-4-slot-smart-charger-ui1-portable-charger-6x-samsung-25r-button-top-18650-battery-bundle","title":"NITECORE UMS4 4-Slot Smart Charger + UI1 Portable Charger \u0026 6x Samsung 25R Button Top 18650 Battery Bundle","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;184-202\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:508;204-711\"\u003eSix high-drain cells need a charging setup that can keep up — at home and on the go. This bundle pairs 6 genuine Samsung 25R Button Top batteries with the NITECORE UMS4 (a 4-bay smart LCD charger for fast, monitored charging at your desk) and the NITECORE UI1 (an ultra-compact single-slot charger for travel or topping off a spare cell). Together, all 6 batteries can be charged at once — 4 in the UMS4, 2 more with a second UI1 or staggered through the UI1 — with full visibility into every cell's health.\u003c\/p\u003e\n\u003cp data-sourcepos=\"8:1-8:508;204-711\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Button Top. Looking for Flat Top? \u003ca href=\"https:\/\/oneandes.com\/product\/nitecore-ums4-4-slot-smart-charger-ui1-portable-charger-6x-samsung-25r-flat-top-18650-battery-bundle\/\"\u003eClick here to buy: Samsung INR18650-25R Flat To + NITECORE UMS4 + NITECORE UI1 Bundle.\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:52;718-769\"\u003eSamsung INR18650-25R (Button Top) Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-24:120;771-1307\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSamsung INR18650-25R (Button Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eRated Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2500mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e20A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.2V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNMC (Lithium Nickel Manganese Cobalt Oxide)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e18650 (approx.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eΦ18.4mm × 65.3mm)\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eButton Top — positive terminal has a raised nub, suited for devices requiring point contact\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eHigh-output flashlights, power tools, DIY battery packs, and other high-drain applications\u003c\/td\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"26:1-26:201;1309-1509\"\u003e\u003cem\u003eNote: High-drain cells demand careful handling — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"30:1-30:46;1516-1561\"\u003eThe Chargers: NITECORE UMS4 + NITECORE UI1\u003c\/h2\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"32:1-32:44;1563-1606\"\u003eNITECORE UMS4 — 4-Bay Smart LCD Charger\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"33:1-39:73;1607-2441\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"33:1-33:111;1607-1717\"\u003e\n\u003cstrong\u003eUSB-C input with QC support\u003c\/strong\u003e: up to 4,000mA total output, up to 3,000mA on a single bay with a QC adapter\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"34:1-34:76;1718-1793\"\u003e\n\u003cstrong\u003eIndependent 4-bay control\u003c\/strong\u003e: charge and monitor each battery separately\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"35:1-35:147;1794-1940\"\u003e\n\u003cstrong\u003eReal-time LCD display\u003c\/strong\u003e: shows battery health (Good\/Poor), internal resistance, charging current, voltage, charged capacity, and charging time\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"36:1-36:116;1941-2056\"\u003e\n\u003cstrong\u003e3 automatic charging modes\u003c\/strong\u003e: CC, CV, and -dV\/dt, selected automatically based on battery type and charge level\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"37:1-37:120;2057-2176\"\u003e\n\u003cstrong\u003eManual adjustment\u003c\/strong\u003e: set charging voltage (3.7V\/4.2V\/4.3V) and current (300mA–3000mA) for specialized battery types\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"38:1-38:192;2177-2368\"\u003e\n\u003cstrong\u003eSafety features\u003c\/strong\u003e: automatic internal resistance detection, reverse-polarity and short-circuit protection, overtime charging protection, and over-discharged battery activation\/restoration\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"39:1-39:73;2369-2441\"\u003e\n\u003cstrong\u003eFire-retardant PC\/ABS housing\u003c\/strong\u003e with built-in temperature regulation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"41:1-41:47;2443-2489\"\u003eNITECORE UI1 — Compact Single-Slot Charger\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"42:1-46:136;2490-2959\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"42:1-42:126;2490-2615\"\u003e\n\u003cstrong\u003eType-C input\u003c\/strong\u003e: automatically adapts to the optimal charging mode, works with power banks, solar panels, and USB adapters\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"43:1-43:62;2616-2677\"\u003e\n\u003cstrong\u003eUp to 1000mA output\u003c\/strong\u003e with automatic CC\/CV mode selection\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"44:1-44:83;2678-2760\"\u003e\n\u003cstrong\u003eTrickle charging\u003c\/strong\u003e protects over-discharged cells and extends battery lifespan\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"45:1-45:63;2761-2823\"\u003e\n\u003cstrong\u003eOver-discharge activation\u003c\/strong\u003e for protected Li-ion batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"46:1-46:136;2824-2959\"\u003e\n\u003cstrong\u003eUltra-lightweight\u003c\/strong\u003e: just 40.5g — ideal for travel, a backup charge, or topping off the 6th cell while the UMS4 handles the other 4\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"50:1-50:37;2966-3002\"\u003eSupported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"52:1-55:56;3004-3450\"\u003e\u003cstrong\u003eNITECORE UMS4\u003c\/strong\u003e — compatible with 3.6V\/3.7V Li-ion, 3.8V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH\/Ni-Cd batteries, including the Samsung 25R (18650) in this bundle: IMR\/Li-ion\/LiFePO4: 10440, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 Ni-MH\/Ni-Cd: AA, AAA, AAAA, C, D Output: up to 3,000mA per bay (QC mode) \/ 4,000mA total\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"57:1-59:55;3452-3832\"\u003e\u003cstrong\u003eNITECORE UI1\u003c\/strong\u003e — compatible with 3.6V\/3.7V Li-ion\/IMR batteries, including the Samsung 25R (18650): 10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650 Output voltage: 4.2V±1% · Output current: up to 1000mA\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"63:1-63:23;3839-3861\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"65:1-65:231;3863-4093\"\u003eBoth the UMS4 and UI1 use spring-loaded contacts that accommodate Button Top and Flat Top batteries without any adapter. Samsung 25R Button Top cells measure about 65.3mm, well within the compatible battery range of both chargers.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"69:1-69:19;4100-4118\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"71:1-75:19;4120-4285\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"71:1-71:46;4120-4165\"\u003eSamsung INR18650-25R Button Top Battery × 6\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"72:1-72:34;4166-4199\"\u003eNITECORE UMS4 4-Bay Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"73:1-73:39;4200-4238\"\u003eNITECORE UI1 Single-Slot Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"74:1-74:28;4239-4266\"\u003eUSB-C Charging Cables × 2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"75:1-75:19;4267-4285\"\u003eUser Manuals × 2\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Button Top. For Flat Top\u003ca href=\"https:\/\/oneandes.com\/product\/nitecore-ums4-4-slot-smart-charger-ui1-portable-charger-6x-samsung-25r-flat-top-18650-battery-bundle\/\"\u003e click here\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"79:1-79:15;4292-4306\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"81:1-84:132;4308-4689\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"81:1-81:105;4308-4412\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"82:1-82:63;4413-4475\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"83:1-83:82;4476-4557\"\u003eCharge only with genuine, compatible chargers such as the NITECORE UMS4 and UI1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"84:1-84:132;4558-4689\"\u003eThese are high-drain cells intended for compatible, purpose-built devices — do not use them in unauthorized or modified equipment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"88:1-88:7;4696-4702\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"90:1-91:207;4704-4964\"\u003e\u003cstrong\u003eQ: Can I charge all 6 batteries at the same time?\u003c\/strong\u003e A: Yes. The UMS4 charges 4 batteries independently and simultaneously, while the UI1 can charge a 5th or 6th battery alongside it — or you can stagger charging through the UI1 if only one is used at a time.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"93:1-94:144;4966-5186\"\u003e\u003cstrong\u003eQ: Are Samsung 25R Button Top batteries safe to charge in both chargers?\u003c\/strong\u003e A: Yes. Both the UMS4 and UI1 automatically recognize Li-ion chemistry and apply the correct charging voltage (4.2V) and current for 25R cells.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"96:1-97:299;5188-5556\"\u003e\u003cstrong\u003eQ: What's the difference between the UMS4 and UI1 in this bundle?\u003c\/strong\u003e A: The UMS4 is a 4-bay charger with an LCD screen showing detailed real-time data (battery health, internal resistance, voltage, capacity) and faster QC charging up to 3,000mA per bay. The UI1 is a single-slot, ultra-compact charger (40.5g) best suited for travel or charging one battery at a time.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"99:1-100:188;5558-5817\"\u003e\u003cstrong\u003eQ: What's the difference between Button Top and Flat Top batteries?\u003c\/strong\u003e A: The only difference is the shape of the positive terminal — Button Top has a raised nub for point contact, while Flat Top is level. Capacity, voltage, and discharge rate are identical.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"102:1-103:125;5819-6021\"\u003e\u003cstrong\u003eQ: Do I need an adapter to charge Button Top batteries in either charger?\u003c\/strong\u003e A: No. Both the UMS4 and UI1 have spring-loaded contacts that accommodate Button Top and Flat Top cells without any adapter.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"105:1-106:173;6023-6243\"\u003e\u003cstrong\u003eQ: How do I check if a battery is degraded?\u003c\/strong\u003e A: The UMS4's LCD display shows battery health as \"Good\" or \"Poor\" along with internal resistance readings, making it easy to spot cells that have aged or lost performance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"108:1-109:219;6245-6525\"\u003e\u003cstrong\u003eQ: Is 20A continuous discharge safe for everyday devices?\u003c\/strong\u003e A: These are high-drain cells built for devices that specifically call for high continuous discharge, such as certain  flashlights, and power tools. Always check your device's battery requirements before use.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"111:1-112:158;6527-6710\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 6 Samsung INR18650-25R Button Top batteries, 1 NITECORE UMS4 charger, 1 NITECORE UI1 charger, 2 USB-C charging cables, and user manuals for both chargers.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454222958838,"sku":"OAS1659","price":109.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ums4-ui1-samsung-25r-button-top-6pack-bundle-main_cee694b7-2cc8-47ba-a95e-8baf5917e6e8.webp?v=1786968564"},{"product_id":"nitecore-ums4-4-slot-smart-charger-ui1-portable-charger-6x-samsung-25r-flat-top-18650-battery-bundle","title":"NITECORE UMS4 4-Slot Smart Charger + UI1 Portable Charger \u0026 6x Samsung 25R Flat Top 18650 Battery Bundle","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;182-200\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:506;202-707\"\u003eSix high-drain cells need a charging setup that can keep up — at home and on the go. This bundle pairs 6 genuine Samsung 25R Flat Top batteries with the NITECORE UMS4 (a 4-bay smart LCD charger for fast, monitored charging at your desk) and the NITECORE UI1 (an ultra-compact single-slot charger for travel or topping off a spare cell). Together, all 6 batteries can be charged at once — 4 in the UMS4, 2 more with a second UI1 or staggered through the UI1 — with full visibility into every cell's health.\u003c\/p\u003e\n\u003cp data-sourcepos=\"8:1-8:506;202-707\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Flat Top. Looking for Button Top? \u003ca href=\"https:\/\/oneandes.com\/product\/nitecore-ums4-4-slot-smart-charger-ui1-portable-charger-6x-samsung-25r-button-top-18650-battery-bundle\/\"\u003eClick here to buy: Samsung INR18650-25R Button Top + NITECORE UMS4 + NITECORE UI1 Bundle.\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:50;714-763\"\u003eSamsung INR18650-25R (Flat Top) Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-24:127;765-1300\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSamsung INR18650-25R (Flat Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eRated Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2500mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e20A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.2V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNMC (Lithium Nickel Manganese Cobalt Oxide)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e18650 (approx. Φ18.3mm × 65.0mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top — level positive terminal, suited for devices requiring full-surface contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eBattery packs, power banks, flashlights, power tools, e-bikes, and other devices designed for flat-top cells\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"26:1-26:201;1302-1502\"\u003e\u003cem\u003eNote: High-drain cells demand careful handling — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"30:1-30:46;1509-1554\"\u003eThe Chargers: NITECORE UMS4 + NITECORE UI1\u003c\/h2\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"32:1-32:44;1556-1599\"\u003eNITECORE UMS4 — 4-Bay Smart LCD Charger\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"33:1-39:73;1600-2434\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"33:1-33:111;1600-1710\"\u003e\n\u003cstrong\u003eUSB-C input with QC support\u003c\/strong\u003e: up to 4,000mA total output, up to 3,000mA on a single bay with a QC adapter\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"34:1-34:76;1711-1786\"\u003e\n\u003cstrong\u003eIndependent 4-bay control\u003c\/strong\u003e: charge and monitor each battery separately\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"35:1-35:147;1787-1933\"\u003e\n\u003cstrong\u003eReal-time LCD display\u003c\/strong\u003e: shows battery health (Good\/Poor), internal resistance, charging current, voltage, charged capacity, and charging time\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"36:1-36:116;1934-2049\"\u003e\n\u003cstrong\u003e3 automatic charging modes\u003c\/strong\u003e: CC, CV, and -dV\/dt, selected automatically based on battery type and charge level\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"37:1-37:120;2050-2169\"\u003e\n\u003cstrong\u003eManual adjustment\u003c\/strong\u003e: set charging voltage (3.7V\/4.2V\/4.3V) and current (300mA–3000mA) for specialized battery types\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"38:1-38:192;2170-2361\"\u003e\n\u003cstrong\u003eSafety features\u003c\/strong\u003e: automatic internal resistance detection, reverse-polarity and short-circuit protection, overtime charging protection, and over-discharged battery activation\/restoration\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"39:1-39:73;2362-2434\"\u003e\n\u003cstrong\u003eFire-retardant PC\/ABS housing\u003c\/strong\u003e with built-in temperature regulation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"41:1-41:47;2436-2482\"\u003eNITECORE UI1 — Compact Single-Slot Charger\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"42:1-46:136;2483-2952\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"42:1-42:126;2483-2608\"\u003e\n\u003cstrong\u003eType-C input\u003c\/strong\u003e: automatically adapts to the optimal charging mode, works with power banks, solar panels, and USB adapters\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"43:1-43:62;2609-2670\"\u003e\n\u003cstrong\u003eUp to 1000mA output\u003c\/strong\u003e with automatic CC\/CV mode selection\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"44:1-44:83;2671-2753\"\u003e\n\u003cstrong\u003eTrickle charging\u003c\/strong\u003e protects over-discharged cells and extends battery lifespan\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"45:1-45:63;2754-2816\"\u003e\n\u003cstrong\u003eOver-discharge activation\u003c\/strong\u003e for protected Li-ion batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"46:1-46:136;2817-2952\"\u003e\n\u003cstrong\u003eUltra-lightweight\u003c\/strong\u003e: just 40.5g — ideal for travel, a backup charge, or topping off the 6th cell while the UMS4 handles the other 4\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"50:1-50:37;2959-2995\"\u003eSupported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"52:1-55:56;2997-3443\"\u003e\u003cstrong\u003eNITECORE UMS4\u003c\/strong\u003e — compatible with 3.6V\/3.7V Li-ion, 3.8V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH\/Ni-Cd batteries, including the Samsung 25R (18650) in this bundle: IMR\/Li-ion\/LiFePO4: 10440, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 Ni-MH\/Ni-Cd: AA, AAA, AAAA, C, D Output: up to 3,000mA per bay (QC mode) \/ 4,000mA total\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"57:1-59:55;3445-3825\"\u003e\u003cstrong\u003eNITECORE UI1\u003c\/strong\u003e — compatible with 3.6V\/3.7V Li-ion\/IMR batteries, including the Samsung 25R (18650): 10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650 Output voltage: 4.2V±1% · Output current: up to 1000mA\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"63:1-63:23;3832-3854\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"65:1-65:229;3856-4084\"\u003eBoth the UMS4 and UI1 use spring-loaded contacts that accommodate Flat Top and Button Top batteries without any adapter. Samsung 25R Flat Top cells measure about 65.0mm, well within the compatible battery range of both chargers.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"69:1-69:19;4091-4109\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"71:1-75:19;4111-4274\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"71:1-71:44;4111-4154\"\u003eSamsung INR18650-25R Flat Top Battery × 6\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"72:1-72:34;4155-4188\"\u003eNITECORE UMS4 4-Bay Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"73:1-73:39;4189-4227\"\u003eNITECORE UI1 Single-Slot Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"74:1-74:28;4228-4255\"\u003eUSB-C Charging Cables × 2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"75:1-75:19;4256-4274\"\u003eUser Manuals × 2\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Flat Top. For Button Top\u003ca href=\"https:\/\/oneandes.com\/product\/nitecore-ums4-4-slot-smart-charger-ui1-portable-charger-6x-samsung-25r-button-top-18650-battery-bundle\/\"\u003e click here\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"79:1-79:15;4281-4295\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"81:1-85:187;4297-4865\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"81:1-81:105;4297-4401\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"82:1-82:63;4402-4464\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"83:1-83:82;4465-4546\"\u003eCharge only with genuine, compatible chargers such as the NITECORE UMS4 and UI1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"84:1-84:132;4547-4678\"\u003eThese are high-drain cells intended for compatible, purpose-built devices — do not use them in unauthorized or modified equipment\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"85:1-85:187;4679-4865\"\u003eFlat Top batteries are commonly used in devices with spring or flat-contact battery holders (e.g., battery packs and power tools) — check your device's terminal requirements before use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"89:1-89:7;4872-4878\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"91:1-92:207;4880-5140\"\u003e\u003cstrong\u003eQ: Can I charge all 6 batteries at the same time?\u003c\/strong\u003e A: Yes. The UMS4 charges 4 batteries independently and simultaneously, while the UI1 can charge a 5th or 6th battery alongside it — or you can stagger charging through the UI1 if only one is used at a time.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"94:1-95:144;5142-5360\"\u003e\u003cstrong\u003eQ: Are Samsung 25R Flat Top batteries safe to charge in both chargers?\u003c\/strong\u003e A: Yes. Both the UMS4 and UI1 automatically recognize Li-ion chemistry and apply the correct charging voltage (4.2V) and current for 25R cells.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"97:1-98:299;5362-5730\"\u003e\u003cstrong\u003eQ: What's the difference between the UMS4 and UI1 in this bundle?\u003c\/strong\u003e A: The UMS4 is a 4-bay charger with an LCD screen showing detailed real-time data (battery health, internal resistance, voltage, capacity) and faster QC charging up to 3,000mA per bay. The UI1 is a single-slot, ultra-compact charger (40.5g) best suited for travel or charging one battery at a time.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"100:1-101:195;5732-5998\"\u003e\u003cstrong\u003eQ: What's the difference between Flat Top and Button Top batteries?\u003c\/strong\u003e A: The only difference is the shape of the positive terminal — Flat Top is level for full-surface contact, while Button Top has a raised nub. Capacity, voltage, and discharge rate are identical.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"103:1-104:133;6000-6199\"\u003e\u003cstrong\u003eQ: Will Flat Top batteries sit properly in both charger slots?\u003c\/strong\u003e A: Yes. Both the UMS4 and UI1 have spring-loaded contacts designed to accommodate Flat Top and Button Top cells without any adapter.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"106:1-107:173;6201-6421\"\u003e\u003cstrong\u003eQ: How do I check if a battery is degraded?\u003c\/strong\u003e A: The UMS4's LCD display shows battery health as \"Good\" or \"Poor\" along with internal resistance readings, making it easy to spot cells that have aged or lost performance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"109:1-110:227;6423-6711\"\u003e\u003cstrong\u003eQ: Is 20A continuous discharge safe for everyday devices?\u003c\/strong\u003e A: These are high-drain cells built for devices that specifically call for high continuous discharge, such as certain power tools, flashlights, and DIY battery packs. Always check your device's battery requirements before use.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"112:1-113:156;6713-6894\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 6 Samsung INR18650-25R Flat Top batteries, 1 NITECORE UMS4 charger, 1 NITECORE UI1 charger, 2 USB-C charging cables, and user manuals for both chargers.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454222991606,"sku":"OAS1665","price":109.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ums4-ui1-samsung-25r-flat-top-6pack-bundle-main_b620b4ff-af0a-4846-bc2e-43930ea34431.webp?v=1786968569"},{"product_id":"nitecore-ums2-2-slot-smart-charger-2x-samsung-20s-flat-top-18650-battery-kit-30a-high-drain","title":"NITECORE UMS2 2-Slot Smart Charger \u0026 2x Samsung 20S Flat Top 18650 Battery Kit (30A High Drain)","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;175-193\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:460;195-654\"\u003eThe Samsung 20S is one of the hardest-hitting 18650 cells available — built for devices that demand serious continuous current. A cell this powerful deserves a charger that can monitor it closely and charge it safely. This bundle pairs 2 genuine Samsung 20S Flat Top batteries with the NITECORE UMS2, a QC-enabled dual-slot charger with a detailed LCD display, independent bay control, and multiple layers of protection — ready to use straight out of the box.\u003c\/p\u003e\n\u003cp data-sourcepos=\"8:1-8:460;195-654\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Flat Top. Looking for Button Top? \u003ca href=\"https:\/\/oneandes.com\/product\/nitecore-ums4-4-slot-smart-charger-ui1-portable-charger-6x-samsung-25r-button-top-18650-battery-bundle\/\"\u003eClick here to buy: \u003c\/a\u003e\u003ca href=\"https:\/\/oneandes.com\/product\/nitecore-ums2-2-slot-smart-charger-2x-samsung-20s-button-top-18650-battery-kit-30a-high-drain\/\"\u003e Samsung INR18650-20S Button Top + Nitecore UMS2\u003c\/a\u003e\u003ca href=\"https:\/\/oneandes.com\/product\/nitecore-ums4-4-slot-smart-charger-ui1-portable-charger-6x-samsung-25r-button-top-18650-battery-bundle\/\"\u003e Bundle.\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:50;661-710\"\u003eSamsung INR18650-20S (Flat Top) Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-25:152;712-1309\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSamsung INR18650-20S (Flat Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eRated Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2000mAh (min.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e30A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.20V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDischarge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eIMR (Lithium Manganese, high-drain)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e18650 (approx. Φ18.43mm × 65.0mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top — level positive terminal, suited for devices requiring full-surface contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eBattery pack assemblies, power tools, high-output flashlights, electric mobility systems, and other extreme high-current applications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"27:1-27:197;1311-1507\"\u003e\u003cem\u003eNote: This is an extremely high-drain cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"31:1-31:30;1514-1543\"\u003eThe Charger: NITECORE UMS2\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"33:1-40:109;1545-2595\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"33:1-33:181;1545-1725\"\u003e\n\u003cstrong\u003eUSB-C input with QC support\u003c\/strong\u003e: up to 4,000mA total output; up to 3,000mA on a single bay with a QC 2.0+ adapter, or 1,000mA per bay (2,000mA total) with a standard 5V\/2A source\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"34:1-34:111;1726-1836\"\u003e\n\u003cstrong\u003eIndependent dual-bay control\u003c\/strong\u003e: charge and monitor 2 batteries separately, without one affecting the other\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"35:1-35:202;1837-2038\"\u003e\n\u003cstrong\u003eDetailed real-time LCD display\u003c\/strong\u003e: shows battery health (Good\/Poor), internal resistance, charging current, voltage, battery type, charged capacity, charging time, cut-off voltage, and charging mode\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"36:1-36:116;2039-2154\"\u003e\n\u003cstrong\u003e3 automatic charging modes\u003c\/strong\u003e: CC, CV, and -dV\/dt, selected automatically based on battery type and charge level\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"37:1-37:96;2155-2250\"\u003e\n\u003cstrong\u003eManual adjustment\u003c\/strong\u003e: set charging current and cut-off voltage for specialized battery types\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"38:1-38:200;2251-2450\"\u003e\n\u003cstrong\u003eSafety features\u003c\/strong\u003e: automatic internal resistance detection, reverse-polarity and short-circuit protection, over-discharged battery activation\/restoration, and automatic termination on full charge\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"39:1-39:36;2451-2486\"\u003e\u003cstrong\u003eFire-retardant PC\/ABS housing\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"40:1-40:109;2487-2595\"\u003e\n\u003cstrong\u003eUniversal power input\u003c\/strong\u003e: works with wall adapters, power banks, car chargers, and solar panels via USB-C\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"44:1-44:53;2602-2654\"\u003eNITECORE UMS2 – Supported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"46:1-46:110;2656-2765\"\u003e\u003cstrong\u003eCompatible with 3.6V\/3.7V Li-ion\/IMR\/LiFePO4 batteries\u003c\/strong\u003e, including the Samsung 20S (18650) in this bundle:\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"48:1-48:176;2767-2942\"\u003e10440, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"50:1-50:73;2944-3016\"\u003e\u003cstrong\u003eAlso compatible with 1.2V Ni-MH\/Ni-Cd batteries:\u003c\/strong\u003e AA, AAA, AAAA, C, D\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"52:1-52:92;3018-3109\"\u003e\u003cstrong\u003eOutput current:\u003c\/strong\u003e QC Mode — 3,000mA×1 \/ 2,000mA×2 · Standard Mode — 2,000mA×1 \/ 1,000mA×2\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"56:1-56:23;3116-3138\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"58:1-58:201;3140-3340\"\u003eThe UMS2 uses spring-loaded contacts that accommodate Flat Top batteries securely without any adapter. Samsung 20S Flat Top cells measure about 65.0mm, well within the UMS2's compatible battery range.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"62:1-62:19;3347-3365\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"64:1-67:18;3367-3483\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"64:1-64:44;3367-3410\"\u003eSamsung INR18650-20S Flat Top Battery × 2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"65:1-65:28;3411-3438\"\u003eNITECORE UMS2 Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"66:1-66:27;3439-3465\"\u003eUSB-C Charging Cable × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"67:1-67:18;3466-3483\"\u003eUser Manual × 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Flat Top. For Button Top\u003ca href=\"https:\/\/oneandes.com\/product\/nitecore-ums2-2-slot-smart-charger-2x-samsung-20s-button-top-18650-battery-kit-30a-high-drain\/\"\u003e click here\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"71:1-71:15;3490-3504\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"73:1-77:187;3506-4128\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"73:1-73:105;3506-3610\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"74:1-74:63;3611-3673\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"75:1-75:75;3674-3748\"\u003eCharge only with a genuine, compatible charger such as the NITECORE UMS2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"76:1-76:193;3749-3941\"\u003eThe Samsung 20S is an extreme high-drain cell intended strictly for compatible, purpose-built devices designed for 30A continuous discharge — do not use in unauthorized or modified equipment\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"77:1-77:187;3942-4128\"\u003eFlat Top batteries are commonly used in devices with spring or flat-contact battery holders (e.g., battery packs and power tools) — check your device's terminal requirements before use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"81:1-81:7;4135-4141\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"83:1-84:181;4143-4398\"\u003e\u003cstrong\u003eQ: Can the NITECORE UMS2 charge Samsung 20S Flat Top batteries safely?\u003c\/strong\u003e A: Yes. The UMS2 automatically detects Li-ion\/IMR chemistry and applies the correct charging voltage (4.2V) and current for 20S cells, with real-time monitoring on its LCD display.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"86:1-87:195;4400-4666\"\u003e\u003cstrong\u003eQ: What's the difference between Flat Top and Button Top batteries?\u003c\/strong\u003e A: The only difference is the shape of the positive terminal — Flat Top is level for full-surface contact, while Button Top has a raised nub. Capacity, voltage, and discharge rate are identical.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"89:1-90:142;4668-4879\"\u003e\u003cstrong\u003eQ: Will Flat Top batteries sit properly in the UMS2 charger bays?\u003c\/strong\u003e A: Yes. The UMS2's spring-loaded contacts are designed to accommodate both Flat Top and Button Top cells without any adapter or modification.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"92:1-93:200;4881-5133\"\u003e\u003cstrong\u003eQ: Can I charge both batteries at the same time?\u003c\/strong\u003e A: Yes. The UMS2 has 2 independent bays. With a QC adapter you'll get up to 2,000mA per bay simultaneously (or 3,000mA if only one bay is in use); with a standard 5V\/2A source, up to 1,000mA per bay.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"95:1-96:173;5135-5358\"\u003e\u003cstrong\u003eQ: How do I know if a 20S battery is degraded?\u003c\/strong\u003e A: The UMS2's LCD display shows battery health as \"Good\" or \"Poor\" along with internal resistance readings, making it easy to spot cells that have aged or lost performance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"98:1-99:327;5360-5748\"\u003e\u003cstrong\u003eQ: Is 30A continuous discharge safe for everyday devices?\u003c\/strong\u003e A: No — the Samsung 20S is one of the highest-drain 18650 cells available and is intended strictly for devices specifically engineered for extreme continuous discharge, such as certain power tools, high-output flashlights, and professional battery pack assemblies. Always confirm your device's current requirements before use.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"101:1-102:110;5750-5922\"\u003e\u003cstrong\u003eQ: Can I power the UMS2 with a power bank while traveling?\u003c\/strong\u003e A: Yes. The UMS2 has a USB-C input and works with wall adapters, power banks, car chargers, and solar panels.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"104:1-105:114;5924-6063\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 2 Samsung INR18650-20S Flat Top batteries, 1 NITECORE UMS2 charger, a USB-C charging cable, and a user manual.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454223024374,"sku":"OAS1671","price":48.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ums2-samsung-20s-flat-top-2pack-kit-main_0cdf1022-5576-4efd-814b-dd324c6fe496.webp?v=1786968575"},{"product_id":"nitecore-ums4-4-slot-smart-charger-4x-samsung-20s-flat-top-18650-battery-kit-30a-high-drain","title":"NITECORE UMS4 4-Slot Smart Charger \u0026 4x Samsung 20S Flat Top 18650 Battery Kit (30A High Drain)","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;172-190\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:499;192-690\"\u003eThe Samsung 20S is one of the hardest-hitting 18650 cells available — built for devices that demand serious continuous current. A cell this powerful deserves a charger that can monitor it closely and charge it safely. This bundle pairs 4 genuine Samsung 20S Flat Top batteries with the NITECORE UMS4, a QC-enabled 4-slot charger with a detailed LCD display, independent bay control, and multiple layers of protection — enough capacity to charge every cell in your set at once, ready out of the box.\u003c\/p\u003e\n\u003cp data-sourcepos=\"8:1-8:499;192-690\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Flat Top. Looking for Button Top? \u003ca href=\"https:\/\/oneandes.com\/product\/nitecore-ums4-4-slot-smart-charger-ui1-portable-charger-6x-samsung-25r-button-top-18650-battery-bundle\/\"\u003eClick here to buy: \u003c\/a\u003e\u003ca href=\"https:\/\/oneandes.com\/product\/nitecore-ums4-4-slot-smart-charger-4x-samsung-20s-button-top-18650-battery-kit-30a-high-drain\/\"\u003e Samsung INR18650-20S Button Top + Nitecore UMS4\u003c\/a\u003e\u003ca href=\"https:\/\/oneandes.com\/product\/nitecore-ums4-4-slot-smart-charger-ui1-portable-charger-6x-samsung-25r-button-top-18650-battery-bundle\/\"\u003e Bundle.\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:50;697-746\"\u003eSamsung INR18650-20S (Flat Top) Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-25:152;748-1345\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSamsung INR18650-20S (Flat Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eRated Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2000mAh (min.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e30A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.20V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDischarge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eIMR (Lithium Manganese, high-drain)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e18650 (approx. Φ18.43mm × 65.0mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top — level positive terminal, suited for devices requiring full-surface contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eBattery pack assemblies, power tools, high-output flashlights, electric mobility systems, and other extreme high-current applications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"27:1-27:197;1347-1543\"\u003e\u003cem\u003eNote: This is an extremely high-drain cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"31:1-31:30;1550-1579\"\u003eThe Charger: NITECORE UMS4\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"33:1-41:95;1581-2687\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"33:1-33:111;1581-1691\"\u003e\n\u003cstrong\u003eUSB-C input with QC support\u003c\/strong\u003e: up to 4,000mA total output; up to 3,000mA on a single bay with a QC adapter\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"34:1-34:109;1692-1800\"\u003e\n\u003cstrong\u003eQC Mode output\u003c\/strong\u003e: 3,000mA×1 \/ 2,000mA×2 \/ 1,000mA×4 — \u003cstrong\u003eStandard Mode\u003c\/strong\u003e: 2,000mA×1 \/ 1,000mA×2 \/ 500mA×4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"35:1-35:121;1801-1921\"\u003e\n\u003cstrong\u003eIndependent 4-bay control\u003c\/strong\u003e: charge and monitor up to 4 batteries separately, with each bay unaffected by the others\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"36:1-36:202;1922-2123\"\u003e\n\u003cstrong\u003eDetailed real-time LCD display\u003c\/strong\u003e: shows battery health (Good\/Poor), internal resistance, charging current, voltage, battery type, charged capacity, charging time, cut-off voltage, and charging mode\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"37:1-37:116;2124-2239\"\u003e\n\u003cstrong\u003e3 automatic charging modes\u003c\/strong\u003e: CC, CV, and -dV\/dt, selected automatically based on battery type and charge level\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"38:1-38:88;2240-2327\"\u003e\n\u003cstrong\u003eManual adjustment\u003c\/strong\u003e: set charging voltage and current for specialized battery types\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"39:1-39:192;2328-2519\"\u003e\n\u003cstrong\u003eSafety features\u003c\/strong\u003e: automatic internal resistance detection, reverse-polarity and short-circuit protection, overtime charging protection, and over-discharged battery activation\/restoration\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"40:1-40:73;2520-2592\"\u003e\n\u003cstrong\u003eFire-retardant PC\/ABS housing\u003c\/strong\u003e with built-in temperature regulation\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"41:1-41:95;2593-2687\"\u003e\n\u003cstrong\u003eUniversal power input\u003c\/strong\u003e: works with wall adapters, power banks, and solar panels via USB-C\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"45:1-45:53;2694-2746\"\u003eNITECORE UMS4 – Supported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"47:1-47:147;2748-2894\"\u003e\u003cstrong\u003eCompatible with 3.6V\/3.7V Li-ion, 3.8V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH\/Ni-Cd batteries\u003c\/strong\u003e, including the Samsung 20S (18650) in this bundle:\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"49:1-50:33;2896-3124\"\u003eIMR\/Li-ion\/LiFePO4: 10440, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 Ni-MH\/Ni-Cd: AA, AAA, AAAA, C, D\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"52:1-52:68;3126-3193\"\u003e\u003cstrong\u003eOutput current:\u003c\/strong\u003e up to 3,000mA per bay (QC mode) \/ 4,000mA total\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"56:1-56:23;3200-3222\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"58:1-58:299;3224-3522\"\u003eThe UMS4 uses spring-loaded contacts that accommodate Flat Top batteries securely without any adapter. Samsung 20S Flat Top cells measure about 65.0mm, well within the UMS4's compatible battery range. All 4 cells in this bundle can be charged simultaneously across the charger's 4 independent bays.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"62:1-62:19;3529-3547\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"64:1-67:18;3549-3671\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"64:1-64:44;3549-3592\"\u003eSamsung INR18650-20S Flat Top Battery × 4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"65:1-65:34;3593-3626\"\u003eNITECORE UMS4 4-Bay Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"66:1-66:27;3627-3653\"\u003eUSB-C Charging Cable × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"67:1-67:18;3654-3671\"\u003eUser Manual × 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Flat Top. For Button Top\u003ca href=\"https:\/\/oneandes.com\/product\/nitecore-ums4-4-slot-smart-charger-4x-samsung-20s-button-top-18650-battery-kit-30a-high-drain\/\"\u003e click here\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"71:1-71:15;3678-3692\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"73:1-77:187;3694-4316\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"73:1-73:105;3694-3798\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"74:1-74:63;3799-3861\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"75:1-75:75;3862-3936\"\u003eCharge only with a genuine, compatible charger such as the NITECORE UMS4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"76:1-76:193;3937-4129\"\u003eThe Samsung 20S is an extreme high-drain cell intended strictly for compatible, purpose-built devices designed for 30A continuous discharge — do not use in unauthorized or modified equipment\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"77:1-77:187;4130-4316\"\u003eFlat Top batteries are commonly used in devices with spring or flat-contact battery holders (e.g., battery packs and power tools) — check your device's terminal requirements before use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"81:1-81:7;4323-4329\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"83:1-84:181;4331-4586\"\u003e\u003cstrong\u003eQ: Can the NITECORE UMS4 charge Samsung 20S Flat Top batteries safely?\u003c\/strong\u003e A: Yes. The UMS4 automatically detects Li-ion\/IMR chemistry and applies the correct charging voltage (4.2V) and current for 20S cells, with real-time monitoring on its LCD display.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"86:1-87:188;4588-4829\"\u003e\u003cstrong\u003eQ: Can I charge all 4 batteries at the same time?\u003c\/strong\u003e A: Yes. The UMS4 has 4 independent bays and can charge all 4 cells simultaneously — up to 1,000mA per bay in QC mode, or 500mA per bay in standard mode, when all 4 slots are used at once.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"89:1-90:195;4831-5097\"\u003e\u003cstrong\u003eQ: What's the difference between Flat Top and Button Top batteries?\u003c\/strong\u003e A: The only difference is the shape of the positive terminal — Flat Top is level for full-surface contact, while Button Top has a raised nub. Capacity, voltage, and discharge rate are identical.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"92:1-93:142;5099-5310\"\u003e\u003cstrong\u003eQ: Will Flat Top batteries sit properly in the UMS4 charger bays?\u003c\/strong\u003e A: Yes. The UMS4's spring-loaded contacts are designed to accommodate both Flat Top and Button Top cells without any adapter or modification.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"95:1-96:173;5312-5535\"\u003e\u003cstrong\u003eQ: How do I know if a 20S battery is degraded?\u003c\/strong\u003e A: The UMS4's LCD display shows battery health as \"Good\" or \"Poor\" along with internal resistance readings, making it easy to spot cells that have aged or lost performance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"98:1-99:327;5537-5925\"\u003e\u003cstrong\u003eQ: Is 30A continuous discharge safe for everyday devices?\u003c\/strong\u003e A: No — the Samsung 20S is one of the highest-drain 18650 cells available and is intended strictly for devices specifically engineered for extreme continuous discharge, such as certain power tools, high-output flashlights, and professional battery pack assemblies. Always confirm your device's current requirements before use.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"101:1-102:96;5927-6085\"\u003e\u003cstrong\u003eQ: Can I power the UMS4 with a power bank while traveling?\u003c\/strong\u003e A: Yes. The UMS4 has a USB-C input and works with wall adapters, power banks, and solar panels.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"104:1-105:114;6087-6226\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 4 Samsung INR18650-20S Flat Top batteries, 1 NITECORE UMS4 charger, a USB-C charging cable, and a user manual.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454223057142,"sku":"OAS1672","price":88.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ums4-samsung-20s-flat-top-4pack-kit-main_3366cb07-339e-4f29-ab57-33b2b6f39146.webp?v=1786968575"},{"product_id":"nitecore-ui2-2-slot-usb-c-charger-2x-sony-murata-us18650-vtc4-flat-top-battery-kit-30a-high-drain","title":"NITECORE UI2 2-Slot USB-C Charger \u0026 2x Sony\/Murata US18650-VTC4 Flat Top Battery Kit (30A High Drain)","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;169-187\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:511;189-699\"\u003eThe Sony\/Murata VTC4 is a legendary high-drain 18650 cell, prized for its true 30A continuous discharge rating and low internal resistance. A cell this capable deserves a charger that treats it right. This bundle pairs 2 genuine Sony\/Murata VTC4 Flat Top batteries with the NITECORE UI2 — a compact, USB-C powered charger that automatically selects the right charging mode and includes trickle charging and over-discharge protection. Everything you need to charge and maintain your cells, ready out of the box.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:54;706-759\"\u003eSony\/Murata US18650-VTC4 (Flat Top) Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-25:143;761-1370\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSony\/Murata US18650-VTC4 (Flat Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eRated Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2100mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e30A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.20±0.05V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDischarge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNMC (Lithium Nickel Manganese Cobalt Oxide), high-drain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e18650 (approx. Φ18.2mm × 65.0mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top — level positive terminal, suited for devices requiring full-surface contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eHigh-performance flashlights, mechanical\/regulated mods, power tools, battery pack builds, and other high-drain applications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"27:1-27:199;1372-1570\"\u003e\u003cem\u003eNote: This is a high-drain, unprotected cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"31:1-31:29;1577-1605\"\u003eThe Charger: NITECORE UI2\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"33:1-39:69;1607-2382\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"33:1-33:113;1607-1719\"\u003e\n\u003cstrong\u003eUSB-C input\u003c\/strong\u003e: charge from any 5V power bank, solar panel, or USB adapter — great for travel and outdoor use\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"34:1-34:100;1720-1819\"\u003e\n\u003cstrong\u003eAutomatic CC\/CV Charging\u003c\/strong\u003e: intelligently selects the most suitable charging mode for each cell\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"35:1-35:105;1820-1924\"\u003e\n\u003cstrong\u003eIndependent Dual-Bay Control\u003c\/strong\u003e: each of the 2 bays charges independently without affecting the other\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"36:1-36:142;1925-2066\"\u003e\n\u003cstrong\u003eTrickle Charging\u003c\/strong\u003e: automatically switches to 100mA trickle mode for batteries below 2.9V, then up to 1000mA standard charging above 2.9V\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"37:1-37:110;2067-2176\"\u003e\n\u003cstrong\u003eOver-Discharge Activation\u003c\/strong\u003e: automatically detects and reactivates over-discharged protected Li-ion cells\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"38:1-38:137;2177-2313\"\u003e\n\u003cstrong\u003eMultiple Safety Protections\u003c\/strong\u003e: reverse-polarity\/short-circuit protection, intelligent temperature control, and overcharge protection\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"39:1-39:69;2314-2382\"\u003e\n\u003cstrong\u003eUltra-Compact \u0026amp; Lightweight\u003c\/strong\u003e: just 79.5g, 125.5 × 59.5 × 32.1mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"43:1-43:52;2389-2440\"\u003eNITECORE UI2 – Supported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"45:1-45:99;2442-2540\"\u003e\u003cstrong\u003eCharges 3.6V\/3.7V Li-ion\/IMR batteries\u003c\/strong\u003e, including the Sony\/Murata VTC4 (18650) in this bundle:\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"47:1-47:225;2542-2766\"\u003e10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"49:1-50:69;2768-2864\"\u003e\u003cstrong\u003eOutput voltage:\u003c\/strong\u003e 4.2V±1% \u003cstrong\u003eOutput current:\u003c\/strong\u003e up to 1000mA per bay (max 2 bays simultaneously)\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"54:1-54:23;2871-2893\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"56:1-56:196;2895-3090\"\u003eThe UI2's charging bays are open-ended, allowing Flat Top batteries to seat securely without any adapter. VTC4 Flat Top cells measure about 65.0mm, well within the UI2's compatible battery range.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"60:1-60:19;3097-3115\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"62:1-65:18;3117-3236\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"62:1-62:48;3117-3164\"\u003eSony\/Murata US18650-VTC4 Flat Top Battery × 2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"63:1-63:27;3165-3191\"\u003eNITECORE UI2 Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"64:1-64:27;3192-3218\"\u003eUSB-C Charging Cable × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"65:1-65:18;3219-3236\"\u003eUser Manual × 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"69:1-69:15;3243-3257\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"71:1-75:50;3259-3697\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"71:1-71:105;3259-3363\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"72:1-72:63;3364-3426\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"73:1-73:74;3427-3500\"\u003eCharge only with a genuine, compatible charger such as the NITECORE UI2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"74:1-74:147;3501-3647\"\u003eThe VTC4 is an unprotected, high-drain cell intended for compatible, purpose-built devices — do not use it in unauthorized or modified equipment\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"75:1-75:50;3648-3697\"\u003eNever discharge below 2.5V or charge above 4.2V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"79:1-79:7;3704-3710\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"81:1-82:158;3712-3948\"\u003e\u003cstrong\u003eQ: Can the NITECORE UI2 charge Sony\/Murata VTC4 Flat Top batteries safely?\u003c\/strong\u003e A: Yes. The UI2 automatically selects the optimal CC\/CV charging mode for Li-ion cells like the VTC4, with a 4.2V±1% output voltage and up to 1000mA per bay.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"84:1-85:137;3950-4155\"\u003e\u003cstrong\u003eQ: Will Flat Top batteries sit properly in the UI2 charger bays?\u003c\/strong\u003e A: Yes. The UI2's open charging bays are designed to accommodate both Flat Top and Button Top cells without any adapter or modification.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"87:1-88:131;4157-4340\"\u003e\u003cstrong\u003eQ: Can I charge both batteries at the same time?\u003c\/strong\u003e A: Yes. The UI2 has 2 independent bays, each capable of up to 1000mA, and one battery's charging status does not affect the other.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"90:1-91:130;4342-4533\"\u003e\u003cstrong\u003eQ: Can I power the UI2 with a power bank while traveling?\u003c\/strong\u003e A: Yes. The UI2 has a USB-C input and works with any 5V power source, including power banks, solar panels, and USB wall adapters.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"93:1-94:284;4535-4877\"\u003e\u003cstrong\u003eQ: What happens if a VTC4 battery has over-discharged?\u003c\/strong\u003e A: The UI2 includes an over-discharge activation feature that automatically detects and reactivates protected Li-ion cells that have dropped too low from storage or improper use. Note that the VTC4 is an unprotected cell, so always avoid discharging it below 2.5V in the first place.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"96:1-97:268;4879-5208\"\u003e\u003cstrong\u003eQ: Is 30A continuous discharge safe for everyday devices?\u003c\/strong\u003e A: No — the VTC4 is a high-drain cell intended strictly for devices specifically engineered for high continuous discharge, such as certain mechanical\/regulated mods, high-output flashlights, and power tools. Always check your device's battery requirements before use.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"99:1-100:196;5210-5470\"\u003e\u003cstrong\u003eQ: How long does the VTC4's 2100mAh capacity typically last?\u003c\/strong\u003e A: Runtime depends on your device's power draw. The VTC4 trades some capacity for its high 30A discharge rating, so it's better suited to high-drain use than to long-runtime, low-current devices.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"102:1-103:117;5472-5614\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 2 Sony\/Murata US18650-VTC4 Flat Top batteries, 1 NITECORE UI2 charger, a USB-C charging cable, and a user manual.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454223122678,"sku":"OAS1731","price":25.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ui2-sony-vtc4-flat-top-2pack-kit-main_71ca6fc6-5a49-40f2-a449-fd39e9d96847.webp?v=1786968586"},{"product_id":"nitecore-ums4-4-slot-smart-charger-4x-sony-murata-us18650-vtc4-flat-top-battery-kit-30a-high-drain","title":"NITECORE UMS4 4-Slot Smart Charger \u0026 4x Sony\/Murata US18650-VTC4 Flat Top Battery Kit (30A High Drain)","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;177-195\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:500;197-696\"\u003eThe Sony\/Murata VTC4 is a legendary high-drain 18650 cell, prized for its true 30A continuous discharge rating and low internal resistance. A set this capable deserves a charger that can handle every cell at once while keeping close watch on their health. This bundle pairs 4 genuine Sony\/Murata VTC4 Flat Top batteries with the NITECORE UMS4, a QC-enabled 4-slot charger with a detailed LCD display, independent bay control, and multiple layers of protection — ready to use straight out of the box.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:54;703-756\"\u003eSony\/Murata US18650-VTC4 (Flat Top) Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-25:143;758-1367\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSony\/Murata US18650-VTC4 (Flat Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eRated Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2100mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e30A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.20±0.05V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDischarge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNMC (Lithium Nickel Manganese Cobalt Oxide), high-drain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e18650 (approx. Φ18.2mm × 65.0mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top — level positive terminal, suited for devices requiring full-surface contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eHigh-performance flashlights, mechanical\/regulated mods, power tools, battery pack builds, and other high-drain applications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"27:1-27:199;1369-1567\"\u003e\u003cem\u003eNote: This is a high-drain, unprotected cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"31:1-31:30;1574-1603\"\u003eThe Charger: NITECORE UMS4\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"33:1-41:95;1605-2711\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"33:1-33:111;1605-1715\"\u003e\n\u003cstrong\u003eUSB-C input with QC support\u003c\/strong\u003e: up to 4,000mA total output; up to 3,000mA on a single bay with a QC adapter\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"34:1-34:109;1716-1824\"\u003e\n\u003cstrong\u003eQC Mode output\u003c\/strong\u003e: 3,000mA×1 \/ 2,000mA×2 \/ 1,000mA×4 — \u003cstrong\u003eStandard Mode\u003c\/strong\u003e: 2,000mA×1 \/ 1,000mA×2 \/ 500mA×4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"35:1-35:121;1825-1945\"\u003e\n\u003cstrong\u003eIndependent 4-bay control\u003c\/strong\u003e: charge and monitor up to 4 batteries separately, with each bay unaffected by the others\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"36:1-36:202;1946-2147\"\u003e\n\u003cstrong\u003eDetailed real-time LCD display\u003c\/strong\u003e: shows battery health (Good\/Poor), internal resistance, charging current, voltage, battery type, charged capacity, charging time, cut-off voltage, and charging mode\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"37:1-37:116;2148-2263\"\u003e\n\u003cstrong\u003e3 automatic charging modes\u003c\/strong\u003e: CC, CV, and -dV\/dt, selected automatically based on battery type and charge level\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"38:1-38:88;2264-2351\"\u003e\n\u003cstrong\u003eManual adjustment\u003c\/strong\u003e: set charging voltage and current for specialized battery types\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"39:1-39:192;2352-2543\"\u003e\n\u003cstrong\u003eSafety features\u003c\/strong\u003e: automatic internal resistance detection, reverse-polarity and short-circuit protection, overtime charging protection, and over-discharged battery activation\/restoration\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"40:1-40:73;2544-2616\"\u003e\n\u003cstrong\u003eFire-retardant PC\/ABS housing\u003c\/strong\u003e with built-in temperature regulation\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"41:1-41:95;2617-2711\"\u003e\n\u003cstrong\u003eUniversal power input\u003c\/strong\u003e: works with wall adapters, power banks, and solar panels via USB-C\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"45:1-45:53;2718-2770\"\u003eNITECORE UMS4 – Supported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"47:1-47:152;2772-2923\"\u003e\u003cstrong\u003eCompatible with 3.6V\/3.7V Li-ion, 3.8V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH\/Ni-Cd batteries\u003c\/strong\u003e, including the Sony\/Murata VTC4 (18650) in this bundle:\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"49:1-50:33;2925-3153\"\u003eIMR\/Li-ion\/LiFePO4: 10440, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 Ni-MH\/Ni-Cd: AA, AAA, AAAA, C, D\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"52:1-52:68;3155-3222\"\u003e\u003cstrong\u003eOutput current:\u003c\/strong\u003e up to 3,000mA per bay (QC mode) \/ 4,000mA total\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"56:1-56:23;3229-3251\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"58:1-58:292;3253-3544\"\u003eThe UMS4 uses spring-loaded contacts that accommodate Flat Top batteries securely without any adapter. VTC4 Flat Top cells measure about 65.0mm, well within the UMS4's compatible battery range. All 4 cells in this bundle can be charged simultaneously across the charger's 4 independent bays.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"62:1-62:19;3551-3569\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"64:1-67:18;3571-3697\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"64:1-64:48;3571-3618\"\u003eSony\/Murata US18650-VTC4 Flat Top Battery × 4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"65:1-65:34;3619-3652\"\u003eNITECORE UMS4 4-Bay Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"66:1-66:27;3653-3679\"\u003eUSB-C Charging Cable × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"67:1-67:18;3680-3697\"\u003eUser Manual × 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"71:1-71:15;3704-3718\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"73:1-78:187;3720-4355\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"73:1-73:105;3720-3824\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"74:1-74:63;3825-3887\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"75:1-75:75;3888-3962\"\u003eCharge only with a genuine, compatible charger such as the NITECORE UMS4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"76:1-76:156;3963-4118\"\u003eThe VTC4 is an unprotected, high-drain cell intended strictly for compatible, purpose-built devices — do not use it in unauthorized or modified equipment\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"77:1-77:50;4119-4168\"\u003eNever discharge below 2.5V or charge above 4.2V\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"78:1-78:187;4169-4355\"\u003eFlat Top batteries are commonly used in devices with spring or flat-contact battery holders (e.g., battery packs and power tools) — check your device's terminal requirements before use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"82:1-82:7;4362-4368\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"84:1-85:178;4370-4627\"\u003e\u003cstrong\u003eQ: Can the NITECORE UMS4 charge Sony\/Murata VTC4 Flat Top batteries safely?\u003c\/strong\u003e A: Yes. The UMS4 automatically detects Li-ion chemistry and applies the correct charging voltage (4.2V) and current for VTC4 cells, with real-time monitoring on its LCD display.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"87:1-88:188;4629-4870\"\u003e\u003cstrong\u003eQ: Can I charge all 4 batteries at the same time?\u003c\/strong\u003e A: Yes. The UMS4 has 4 independent bays and can charge all 4 cells simultaneously — up to 1,000mA per bay in QC mode, or 500mA per bay in standard mode, when all 4 slots are used at once.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"90:1-91:142;4872-5083\"\u003e\u003cstrong\u003eQ: Will Flat Top batteries sit properly in the UMS4 charger bays?\u003c\/strong\u003e A: Yes. The UMS4's spring-loaded contacts are designed to accommodate both Flat Top and Button Top cells without any adapter or modification.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"93:1-94:173;5085-5309\"\u003e\u003cstrong\u003eQ: How do I know if a VTC4 battery is degraded?\u003c\/strong\u003e A: The UMS4's LCD display shows battery health as \"Good\" or \"Poor\" along with internal resistance readings, making it easy to spot cells that have aged or lost performance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"96:1-97:268;5311-5640\"\u003e\u003cstrong\u003eQ: Is 30A continuous discharge safe for everyday devices?\u003c\/strong\u003e A: No — the VTC4 is a high-drain cell intended strictly for devices specifically engineered for high continuous discharge, such as certain mechanical\/regulated mods, high-output flashlights, and power tools. Always check your device's battery requirements before use.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"99:1-100:96;5642-5800\"\u003e\u003cstrong\u003eQ: Can I power the UMS4 with a power bank while traveling?\u003c\/strong\u003e A: Yes. The UMS4 has a USB-C input and works with wall adapters, power banks, and solar panels.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"102:1-103:196;5802-6062\"\u003e\u003cstrong\u003eQ: How long does the VTC4's 2100mAh capacity typically last?\u003c\/strong\u003e A: Runtime depends on your device's power draw. The VTC4 trades some capacity for its high 30A discharge rating, so it's better suited to high-drain use than to long-runtime, low-current devices.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"105:1-106:118;6064-6207\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 4 Sony\/Murata US18650-VTC4 Flat Top batteries, 1 NITECORE UMS4 charger, a USB-C charging cable, and a user manual.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454223155446,"sku":"OAS1732","price":88.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ums4-sony-vtc4-flat-top-4pack-kit-main_3926aa78-e05a-4863-a006-250b327cfc2e.webp?v=1786968586"},{"product_id":"nitecore-ums4-4-slot-charger-ui1-portable-charger-6x-sony-murata-us18650-vtc4-flat-top-battery-kit-30a-high-drain","title":"NITECORE UMS4 4-Slot Charger + UI1 Portable Charger \u0026 6x Sony\/Murata US18650-VTC4 Flat Top Battery Kit (30A High Drain)","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;189-207\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:641;209-849\"\u003eThe Sony\/Murata VTC4 is a legendary high-drain 18650 cell, prized for its true 30A continuous discharge rating and low internal resistance. Six of these cells need a charging setup that can keep up — at home and on the go. This bundle pairs 6 genuine Sony\/Murata VTC4 Flat Top batteries with the NITECORE UMS4 (a 4-bay smart LCD charger for fast, monitored charging at your desk) and the NITECORE UI1 (an ultra-compact single-slot charger for travel or topping off a spare cell). Together, all 6 batteries can be charged at once — 4 in the UMS4, and the 5th and 6th staggered through the UI1 — with full visibility into every cell's health.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:54;856-909\"\u003eSony\/Murata US18650-VTC4 (Flat Top) Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-25:143;911-1520\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSony\/Murata US18650-VTC4 (Flat Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eRated Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2100mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e30A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.20±0.05V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDischarge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNMC (Lithium Nickel Manganese Cobalt Oxide), high-drain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e18650 (approx. Φ18.2mm × 65.0mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top — level positive terminal, suited for devices requiring full-surface contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eHigh-performance flashlights, mechanical\/regulated mods, power tools, battery pack builds, and other high-drain applications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"27:1-27:199;1522-1720\"\u003e\u003cem\u003eNote: This is a high-drain, unprotected cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"31:1-31:46;1727-1772\"\u003eThe Chargers: NITECORE UMS4 + NITECORE UI1\u003c\/h2\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"33:1-33:44;1774-1817\"\u003eNITECORE UMS4 — 4-Bay Smart LCD Charger\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"34:1-40:73;1818-2635\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"34:1-34:111;1818-1928\"\u003e\n\u003cstrong\u003eUSB-C input with QC support\u003c\/strong\u003e: up to 4,000mA total output, up to 3,000mA on a single bay with a QC adapter\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"35:1-35:76;1929-2004\"\u003e\n\u003cstrong\u003eIndependent 4-bay control\u003c\/strong\u003e: charge and monitor each battery separately\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"36:1-36:147;2005-2151\"\u003e\n\u003cstrong\u003eReal-time LCD display\u003c\/strong\u003e: shows battery health (Good\/Poor), internal resistance, charging current, voltage, charged capacity, and charging time\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"37:1-37:116;2152-2267\"\u003e\n\u003cstrong\u003e3 automatic charging modes\u003c\/strong\u003e: CC, CV, and -dV\/dt, selected automatically based on battery type and charge level\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"38:1-38:103;2268-2370\"\u003e\n\u003cstrong\u003eManual adjustment\u003c\/strong\u003e: set charging voltage and current (300mA–3000mA) for specialized battery types\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"39:1-39:192;2371-2562\"\u003e\n\u003cstrong\u003eSafety features\u003c\/strong\u003e: automatic internal resistance detection, reverse-polarity and short-circuit protection, overtime charging protection, and over-discharged battery activation\/restoration\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"40:1-40:73;2563-2635\"\u003e\n\u003cstrong\u003eFire-retardant PC\/ABS housing\u003c\/strong\u003e with built-in temperature regulation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"42:1-42:47;2637-2683\"\u003eNITECORE UI1 — Compact Single-Slot Charger\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"43:1-47:136;2684-3153\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"43:1-43:126;2684-2809\"\u003e\n\u003cstrong\u003eType-C input\u003c\/strong\u003e: automatically adapts to the optimal charging mode, works with power banks, solar panels, and USB adapters\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"44:1-44:62;2810-2871\"\u003e\n\u003cstrong\u003eUp to 1000mA output\u003c\/strong\u003e with automatic CC\/CV mode selection\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"45:1-45:83;2872-2954\"\u003e\n\u003cstrong\u003eTrickle charging\u003c\/strong\u003e protects over-discharged cells and extends battery lifespan\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"46:1-46:63;2955-3017\"\u003e\n\u003cstrong\u003eOver-discharge activation\u003c\/strong\u003e for protected Li-ion batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"47:1-47:136;3018-3153\"\u003e\n\u003cstrong\u003eUltra-lightweight\u003c\/strong\u003e: just 40.5g — ideal for travel, a backup charge, or topping off the 6th cell while the UMS4 handles the other 4\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"51:1-51:37;3160-3196\"\u003eSupported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"53:1-56:56;3198-3649\"\u003e\u003cstrong\u003eNITECORE UMS4\u003c\/strong\u003e — compatible with 3.6V\/3.7V Li-ion, 3.8V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH\/Ni-Cd batteries, including the Sony\/Murata VTC4 (18650) in this bundle: IMR\/Li-ion\/LiFePO4: 10440, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 Ni-MH\/Ni-Cd: AA, AAA, AAAA, C, D Output: up to 3,000mA per bay (QC mode) \/ 4,000mA total\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"58:1-60:55;3651-4036\"\u003e\u003cstrong\u003eNITECORE UI1\u003c\/strong\u003e — compatible with 3.6V\/3.7V Li-ion\/IMR batteries, including the Sony\/Murata VTC4 (18650): 10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650 Output voltage: 4.2V±1% · Output current: up to 1000mA\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"64:1-64:23;4043-4065\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"66:1-66:216;4067-4282\"\u003eBoth the UMS4 and UI1 use spring-loaded contacts that accommodate Flat Top batteries securely without any adapter. VTC4 Flat Top cells measure about 65.0mm, well within the compatible battery range of both chargers.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"70:1-70:19;4289-4307\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"72:1-76:19;4309-4476\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"72:1-72:48;4309-4356\"\u003eSony\/Murata US18650-VTC4 Flat Top Battery × 6\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"73:1-73:34;4357-4390\"\u003eNITECORE UMS4 4-Bay Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"74:1-74:39;4391-4429\"\u003eNITECORE UI1 Single-Slot Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"75:1-75:28;4430-4457\"\u003eUSB-C Charging Cables × 2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"76:1-76:19;4458-4476\"\u003eUser Manuals × 2\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"80:1-80:15;4483-4497\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"82:1-86:50;4499-4954\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"82:1-82:105;4499-4603\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"83:1-83:63;4604-4666\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"84:1-84:82;4667-4748\"\u003eCharge only with genuine, compatible chargers such as the NITECORE UMS4 and UI1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"85:1-85:156;4749-4904\"\u003eThe VTC4 is an unprotected, high-drain cell intended strictly for compatible, purpose-built devices — do not use it in unauthorized or modified equipment\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"86:1-86:50;4905-4954\"\u003eNever discharge below 2.5V or charge above 4.2V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"90:1-90:7;4961-4967\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"92:1-93:207;4969-5229\"\u003e\u003cstrong\u003eQ: Can I charge all 6 batteries at the same time?\u003c\/strong\u003e A: Yes. The UMS4 charges 4 batteries independently and simultaneously, while the UI1 can charge a 5th battery alongside it — or you can stagger the 5th and 6th through the UI1 if only one is used at a time.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"95:1-96:145;5231-5455\"\u003e\u003cstrong\u003eQ: Are Sony\/Murata VTC4 Flat Top batteries safe to charge in both chargers?\u003c\/strong\u003e A: Yes. Both the UMS4 and UI1 automatically recognize Li-ion chemistry and apply the correct charging voltage (4.2V) and current for VTC4 cells.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"98:1-99:299;5457-5825\"\u003e\u003cstrong\u003eQ: What's the difference between the UMS4 and UI1 in this bundle?\u003c\/strong\u003e A: The UMS4 is a 4-bay charger with an LCD screen showing detailed real-time data (battery health, internal resistance, voltage, capacity) and faster QC charging up to 3,000mA per bay. The UI1 is a single-slot, ultra-compact charger (40.5g) best suited for travel or charging one battery at a time.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"101:1-102:138;5827-6031\"\u003e\u003cstrong\u003eQ: Will Flat Top batteries sit properly in both charger slots?\u003c\/strong\u003e A: Yes. Both the UMS4 and UI1 have spring-loaded\/open contact designs that accommodate Flat Top and Button Top cells without any adapter.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"104:1-105:173;6033-6253\"\u003e\u003cstrong\u003eQ: How do I check if a battery is degraded?\u003c\/strong\u003e A: The UMS4's LCD display shows battery health as \"Good\" or \"Poor\" along with internal resistance readings, making it easy to spot cells that have aged or lost performance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"107:1-108:268;6255-6584\"\u003e\u003cstrong\u003eQ: Is 30A continuous discharge safe for everyday devices?\u003c\/strong\u003e A: No — the VTC4 is a high-drain cell intended strictly for devices specifically engineered for high continuous discharge, such as certain mechanical\/regulated mods, high-output flashlights, and power tools. Always check your device's battery requirements before use.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"110:1-111:196;6586-6846\"\u003e\u003cstrong\u003eQ: How long does the VTC4's 2100mAh capacity typically last?\u003c\/strong\u003e A: Runtime depends on your device's power draw. The VTC4 trades some capacity for its high 30A discharge rating, so it's better suited to high-drain use than to long-runtime, low-current devices.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"113:1-114:160;6848-7033\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 6 Sony\/Murata US18650-VTC4 Flat Top batteries, 1 NITECORE UMS4 charger, 1 NITECORE UI1 charger, 2 USB-C charging cables, and user manuals for both chargers.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454223188214,"sku":"OAS1733","price":113.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ums4-ui1-sony-vtc4-flat-top-6pack-bundle-main_380922b8-6a78-4d85-8edb-c1f8ac42ad4c.webp?v=1786968592"},{"product_id":"nitecore-ums4-4-slot-smart-charger-4x-sony-murata-us18650-vtc5-flat-top-battery-kit-2600mah-20a","title":"NITECORE UMS4 4-Slot Smart Charger \u0026 4x Sony\/Murata US18650-VTC5 Flat Top Battery Kit (2600mAh 20A)","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;180-198\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:530;200-729\"\u003eThe Sony\/Murata VTC5 is one of the most respected high-drain 18650 cells on the market — combining a strong 2600mAh capacity with a true 20A continuous discharge rating. A set this capable deserves a charger that can handle every cell at once while keeping close watch on their health. This bundle pairs 4 genuine Sony\/Murata VTC5 Flat Top batteries with the NITECORE UMS4, a QC-enabled 4-slot charger with a detailed LCD display, independent bay control, and multiple layers of protection — ready to use straight out of the box.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:54;736-789\"\u003eSony\/Murata US18650-VTC5 (Flat Top) Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-26:127;791-1430\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSony\/Murata US18650-VTC5 (Flat Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2600mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eRated (Minimum) Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2500mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e20A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.20±0.05V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDischarge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNMC (Lithium Nickel Manganese Cobalt Oxide), high-drain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e18650 (approx. Φ18.2–18.4mm × 65.0mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top — level positive terminal, suited for devices requiring full-surface contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eHigh-performance flashlights, power tools, battery pack builds, and other high-drain applications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"28:1-28:199;1432-1630\"\u003e\u003cem\u003eNote: This is a high-drain, unprotected cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"32:1-32:30;1637-1666\"\u003eThe Charger: NITECORE UMS4\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"34:1-42:95;1668-2774\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"34:1-34:111;1668-1778\"\u003e\n\u003cstrong\u003eUSB-C input with QC support\u003c\/strong\u003e: up to 4,000mA total output; up to 3,000mA on a single bay with a QC adapter\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"35:1-35:109;1779-1887\"\u003e\n\u003cstrong\u003eQC Mode output\u003c\/strong\u003e: 3,000mA×1 \/ 2,000mA×2 \/ 1,000mA×4 — \u003cstrong\u003eStandard Mode\u003c\/strong\u003e: 2,000mA×1 \/ 1,000mA×2 \/ 500mA×4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"36:1-36:121;1888-2008\"\u003e\n\u003cstrong\u003eIndependent 4-bay control\u003c\/strong\u003e: charge and monitor up to 4 batteries separately, with each bay unaffected by the others\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"37:1-37:202;2009-2210\"\u003e\n\u003cstrong\u003eDetailed real-time LCD display\u003c\/strong\u003e: shows battery health (Good\/Poor), internal resistance, charging current, voltage, battery type, charged capacity, charging time, cut-off voltage, and charging mode\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"38:1-38:116;2211-2326\"\u003e\n\u003cstrong\u003e3 automatic charging modes\u003c\/strong\u003e: CC, CV, and -dV\/dt, selected automatically based on battery type and charge level\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"39:1-39:88;2327-2414\"\u003e\n\u003cstrong\u003eManual adjustment\u003c\/strong\u003e: set charging voltage and current for specialized battery types\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"40:1-40:192;2415-2606\"\u003e\n\u003cstrong\u003eSafety features\u003c\/strong\u003e: automatic internal resistance detection, reverse-polarity and short-circuit protection, overtime charging protection, and over-discharged battery activation\/restoration\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"41:1-41:73;2607-2679\"\u003e\n\u003cstrong\u003eFire-retardant PC\/ABS housing\u003c\/strong\u003e with built-in temperature regulation\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"42:1-42:95;2680-2774\"\u003e\n\u003cstrong\u003eUniversal power input\u003c\/strong\u003e: works with wall adapters, power banks, and solar panels via USB-C\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"46:1-46:53;2781-2833\"\u003eNITECORE UMS4 – Supported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"48:1-48:152;2835-2986\"\u003e\u003cstrong\u003eCompatible with 3.6V\/3.7V Li-ion, 3.8V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH\/Ni-Cd batteries\u003c\/strong\u003e, including the Sony\/Murata VTC5 (18650) in this bundle:\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"50:1-51:33;2988-3216\"\u003eIMR\/Li-ion\/LiFePO4: 10440, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 Ni-MH\/Ni-Cd: AA, AAA, AAAA, C, D\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"53:1-53:68;3218-3285\"\u003e\u003cstrong\u003eOutput current:\u003c\/strong\u003e up to 3,000mA per bay (QC mode) \/ 4,000mA total\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"57:1-57:23;3292-3314\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"59:1-59:292;3316-3607\"\u003eThe UMS4 uses spring-loaded contacts that accommodate Flat Top batteries securely without any adapter. VTC5 Flat Top cells measure about 65.0mm, well within the UMS4's compatible battery range. All 4 cells in this bundle can be charged simultaneously across the charger's 4 independent bays.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"63:1-63:19;3614-3632\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"65:1-68:18;3634-3760\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"65:1-65:48;3634-3681\"\u003eSony\/Murata US18650-VTC5 Flat Top Battery × 4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"66:1-66:34;3682-3715\"\u003eNITECORE UMS4 4-Bay Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"67:1-67:27;3716-3742\"\u003eUSB-C Charging Cable × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"68:1-68:18;3743-3760\"\u003eUser Manual × 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"72:1-72:15;3767-3781\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"74:1-79:187;3783-4418\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"74:1-74:105;3783-3887\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"75:1-75:63;3888-3950\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"76:1-76:75;3951-4025\"\u003eCharge only with a genuine, compatible charger such as the NITECORE UMS4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"77:1-77:156;4026-4181\"\u003eThe VTC5 is an unprotected, high-drain cell intended strictly for compatible, purpose-built devices — do not use it in unauthorized or modified equipment\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"78:1-78:50;4182-4231\"\u003eNever discharge below 2.5V or charge above 4.2V\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"79:1-79:187;4232-4418\"\u003eFlat Top batteries are commonly used in devices with spring or flat-contact battery holders (e.g., battery packs and power tools) — check your device's terminal requirements before use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"83:1-83:7;4425-4431\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"85:1-86:178;4433-4690\"\u003e\u003cstrong\u003eQ: Can the NITECORE UMS4 charge Sony\/Murata VTC5 Flat Top batteries safely?\u003c\/strong\u003e A: Yes. The UMS4 automatically detects Li-ion chemistry and applies the correct charging voltage (4.2V) and current for VTC5 cells, with real-time monitoring on its LCD display.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"88:1-89:188;4692-4933\"\u003e\u003cstrong\u003eQ: Can I charge all 4 batteries at the same time?\u003c\/strong\u003e A: Yes. The UMS4 has 4 independent bays and can charge all 4 cells simultaneously — up to 1,000mA per bay in QC mode, or 500mA per bay in standard mode, when all 4 slots are used at once.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"91:1-92:142;4935-5146\"\u003e\u003cstrong\u003eQ: Will Flat Top batteries sit properly in the UMS4 charger bays?\u003c\/strong\u003e A: Yes. The UMS4's spring-loaded contacts are designed to accommodate both Flat Top and Button Top cells without any adapter or modification.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"94:1-95:173;5148-5372\"\u003e\u003cstrong\u003eQ: How do I know if a VTC5 battery is degraded?\u003c\/strong\u003e A: The UMS4's LCD display shows battery health as \"Good\" or \"Poor\" along with internal resistance readings, making it easy to spot cells that have aged or lost performance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"100:1-101:96;5689-5847\"\u003e\u003cstrong\u003eQ: Can I power the UMS4 with a power bank while traveling?\u003c\/strong\u003e A: Yes. The UMS4 has a USB-C input and works with wall adapters, power banks, and solar panels.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"106:1-107:118;6091-6234\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 4 Sony\/Murata US18650-VTC5 Flat Top batteries, 1 NITECORE UMS4 charger, a USB-C charging cable, and a user manual.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454223286518,"sku":"OAS1736","price":95.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ums4-sony-vtc5-flat-top-4pack-kit-main_554be11f-ecb0-4e7b-a14a-42188b87d31b.webp?v=1786968603"},{"product_id":"nitecore-ui2-2-slot-usb-c-charger-2x-sony-murata-us18650-vtc5-flat-top-battery-kit-2600mah-20a","title":"NITECORE UI2 2-Slot USB-C Charger \u0026 2x Sony\/Murata US18650-VTC5 Flat Top Battery Kit (2600mAh 20A)","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;172-190\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:541;192-732\"\u003eThe Sony\/Murata VTC5 is one of the most respected high-drain 18650 cells on the market — combining a strong 2600mAh capacity with a true 20A continuous discharge rating. A cell this capable deserves a charger that treats it right. This bundle pairs 2 genuine Sony\/Murata VTC5 Flat Top batteries with the NITECORE UI2 — a compact, USB-C powered charger that automatically selects the right charging mode and includes trickle charging and over-discharge protection. Everything you need to charge and maintain your cells, ready out of the box.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:54;739-792\"\u003eSony\/Murata US18650-VTC5 (Flat Top) Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-26:127;794-1433\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSony\/Murata US18650-VTC5 (Flat Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2600mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eRated (Minimum) Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2500mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eContinuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e20A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.20±0.05V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDischarge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNMC (Lithium Nickel Manganese Cobalt Oxide), high-drain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e18650 (approx.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eΦ18.2–18.4mm × 65.0mm)\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top — level positive terminal, suited for devices requiring full-surface contact\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eHigh-performance flashlights, power tools, battery pack builds, and other high-drain applications\u003c\/td\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"28:1-28:199;1435-1633\"\u003e\u003cem\u003eNote: This is a high-drain, unprotected cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"32:1-32:29;1640-1668\"\u003eThe Charger: NITECORE UI2\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"34:1-40:69;1670-2445\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"34:1-34:113;1670-1782\"\u003e\n\u003cstrong\u003eUSB-C input\u003c\/strong\u003e: charge from any 5V power bank, solar panel, or USB adapter — great for travel and outdoor use\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"35:1-35:100;1783-1882\"\u003e\n\u003cstrong\u003eAutomatic CC\/CV Charging\u003c\/strong\u003e: intelligently selects the most suitable charging mode for each cell\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"36:1-36:105;1883-1987\"\u003e\n\u003cstrong\u003eIndependent Dual-Bay Control\u003c\/strong\u003e: each of the 2 bays charges independently without affecting the other\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"37:1-37:142;1988-2129\"\u003e\n\u003cstrong\u003eTrickle Charging\u003c\/strong\u003e: automatically switches to 100mA trickle mode for batteries below 2.9V, then up to 1000mA standard charging above 2.9V\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"38:1-38:110;2130-2239\"\u003e\n\u003cstrong\u003eOver-Discharge Activation\u003c\/strong\u003e: automatically detects and reactivates over-discharged protected Li-ion cells\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"39:1-39:137;2240-2376\"\u003e\n\u003cstrong\u003eMultiple Safety Protections\u003c\/strong\u003e: reverse-polarity\/short-circuit protection, intelligent temperature control, and overcharge protection\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"40:1-40:69;2377-2445\"\u003e\n\u003cstrong\u003eUltra-Compact \u0026amp; Lightweight\u003c\/strong\u003e: just 79.5g, 125.5 × 59.5 × 32.1mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"44:1-44:52;2452-2503\"\u003eNITECORE UI2 – Supported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"46:1-46:99;2505-2603\"\u003e\u003cstrong\u003eCharges 3.6V\/3.7V Li-ion\/IMR batteries\u003c\/strong\u003e, including the Sony\/Murata VTC5 (18650) in this bundle:\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"48:1-48:225;2605-2829\"\u003e10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"50:1-51:69;2831-2927\"\u003e\u003cstrong\u003eOutput voltage:\u003c\/strong\u003e 4.2V±1% \u003cstrong\u003eOutput current:\u003c\/strong\u003e up to 1000mA per bay (max 2 bays simultaneously)\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"55:1-55:23;2934-2956\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"57:1-57:196;2958-3153\"\u003eThe UI2's charging bays are open-ended, allowing Flat Top batteries to seat securely without any adapter. VTC5 Flat Top cells measure about 65.0mm, well within the UI2's compatible battery range.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"61:1-61:19;3160-3178\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"63:1-66:18;3180-3299\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"63:1-63:48;3180-3227\"\u003eSony\/Murata US18650-VTC5 Flat Top Battery × 2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"64:1-64:27;3228-3254\"\u003eNITECORE UI2 Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"65:1-65:27;3255-3281\"\u003eUSB-C Charging Cable × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"66:1-66:18;3282-3299\"\u003eUser Manual × 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"70:1-70:15;3306-3320\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"72:1-76:50;3322-3760\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"72:1-72:105;3322-3426\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"73:1-73:63;3427-3489\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"74:1-74:74;3490-3563\"\u003eCharge only with a genuine, compatible charger such as the NITECORE UI2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"75:1-75:147;3564-3710\"\u003eThe VTC5 is an unprotected, high-drain cell intended for compatible, purpose-built devices — do not use it in unauthorized or modified equipment\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"76:1-76:50;3711-3760\"\u003eNever discharge below 2.5V or charge above 4.2V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"80:1-80:7;3767-3773\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"82:1-83:158;3775-4011\"\u003e\u003cstrong\u003eQ: Can the NITECORE UI2 charge Sony\/Murata VTC5 Flat Top batteries safely?\u003c\/strong\u003e A: Yes. The UI2 automatically selects the optimal CC\/CV charging mode for Li-ion cells like the VTC5, with a 4.2V±1% output voltage and up to 1000mA per bay.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"85:1-86:137;4013-4218\"\u003e\u003cstrong\u003eQ: Will Flat Top batteries sit properly in the UI2 charger bays?\u003c\/strong\u003e A: Yes. The UI2's open charging bays are designed to accommodate both Flat Top and Button Top cells without any adapter or modification.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"88:1-89:131;4220-4403\"\u003e\u003cstrong\u003eQ: Can I charge both batteries at the same time?\u003c\/strong\u003e A: Yes. The UI2 has 2 independent bays, each capable of up to 1000mA, and one battery's charging status does not affect the other.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"91:1-92:130;4405-4596\"\u003e\u003cstrong\u003eQ: Can I power the UI2 with a power bank while traveling?\u003c\/strong\u003e A: Yes. The UI2 has a USB-C input and works with any 5V power source, including power banks, solar panels, and USB wall adapters.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"94:1-95:284;4598-4940\"\u003e\u003cstrong\u003eQ: What happens if a VTC5 battery has over-discharged?\u003c\/strong\u003e A: The UI2 includes an over-discharge activation feature that automatically detects and reactivates protected Li-ion cells that have dropped too low from storage or improper use. Note that the VTC5 is an unprotected cell, so always avoid discharging it below 2.5V in the first place.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"103:1-104:117;5499-5641\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 2 Sony\/Murata US18650-VTC5 Flat Top batteries, 1 NITECORE UI2 charger, a USB-C charging cable, and a user manual.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454223319286,"sku":"OAS1735","price":28.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ui2-sony-vtc5-flat-top-2pack-kit-main_0fd0549e-c32f-4cd5-9e39-5655163c100b.webp?v=1786968598"},{"product_id":"nitecore-ums4-4-slot-charger-ui1-portable-charger-6x-sony-murata-us18650-vtc5-flat-top-battery-kit-2600mah-20a","title":"NITECORE UMS4 4-Slot Charger + UI1 Portable Charger \u0026 6x Sony\/Murata US18650-VTC5 Flat Top Battery Kit (2600mAh 20A)","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;192-210\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:671;212-882\"\u003eThe Sony\/Murata VTC5 is one of the most respected high-drain 18650 cells on the market — combining a strong 2600mAh capacity with a true 20A continuous discharge rating. Six of these cells need a charging setup that can keep up — at home and on the go. This bundle pairs 6 genuine Sony\/Murata VTC5 Flat Top batteries with the NITECORE UMS4 (a 4-bay smart LCD charger for fast, monitored charging at your desk) and the NITECORE UI1 (an ultra-compact single-slot charger for travel or topping off a spare cell). Together, all 6 batteries can be charged at once — 4 in the UMS4, and the 5th and 6th staggered through the UI1 — with full visibility into every cell's health.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:54;889-942\"\u003eSony\/Murata US18650-VTC5 (Flat Top) Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-26:127;944-1583\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSony\/Murata US18650-VTC5 (Flat Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2600mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eRated (Minimum) Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2500mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e20A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.20±0.05V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDischarge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNMC (Lithium Nickel Manganese Cobalt Oxide), high-drain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e18650 (approx.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eΦ18.2–18.4mm × 65.0mm)\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top — level positive terminal, suited for devices requiring full-surface contact\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eHigh-performance flashlights, power tools, battery pack builds, and other high-drain applications\u003c\/td\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"28:1-28:199;1585-1783\"\u003e\u003cem\u003eNote: This is a high-drain, unprotected cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"32:1-32:46;1790-1835\"\u003eThe Chargers: NITECORE UMS4 + NITECORE UI1\u003c\/h2\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"34:1-34:44;1837-1880\"\u003eNITECORE UMS4 — 4-Bay Smart LCD Charger\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"35:1-41:73;1881-2698\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"35:1-35:111;1881-1991\"\u003e\n\u003cstrong\u003eUSB-C input with QC support\u003c\/strong\u003e: up to 4,000mA total output, up to 3,000mA on a single bay with a QC adapter\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"36:1-36:76;1992-2067\"\u003e\n\u003cstrong\u003eIndependent 4-bay control\u003c\/strong\u003e: charge and monitor each battery separately\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"37:1-37:147;2068-2214\"\u003e\n\u003cstrong\u003eReal-time LCD display\u003c\/strong\u003e: shows battery health (Good\/Poor), internal resistance, charging current, voltage, charged capacity, and charging time\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"38:1-38:116;2215-2330\"\u003e\n\u003cstrong\u003e3 automatic charging modes\u003c\/strong\u003e: CC, CV, and -dV\/dt, selected automatically based on battery type and charge level\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"39:1-39:103;2331-2433\"\u003e\n\u003cstrong\u003eManual adjustment\u003c\/strong\u003e: set charging voltage and current (300mA–3000mA) for specialized battery types\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"40:1-40:192;2434-2625\"\u003e\n\u003cstrong\u003eSafety features\u003c\/strong\u003e: automatic internal resistance detection, reverse-polarity and short-circuit protection, overtime charging protection, and over-discharged battery activation\/restoration\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"41:1-41:73;2626-2698\"\u003e\n\u003cstrong\u003eFire-retardant PC\/ABS housing\u003c\/strong\u003e with built-in temperature regulation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"43:1-43:47;2700-2746\"\u003eNITECORE UI1 — Compact Single-Slot Charger\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"44:1-48:136;2747-3216\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"44:1-44:126;2747-2872\"\u003e\n\u003cstrong\u003eType-C input\u003c\/strong\u003e: automatically adapts to the optimal charging mode, works with power banks, solar panels, and USB adapters\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"45:1-45:62;2873-2934\"\u003e\n\u003cstrong\u003eUp to 1000mA output\u003c\/strong\u003e with automatic CC\/CV mode selection\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"46:1-46:83;2935-3017\"\u003e\n\u003cstrong\u003eTrickle charging\u003c\/strong\u003e protects over-discharged cells and extends battery lifespan\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"47:1-47:63;3018-3080\"\u003e\n\u003cstrong\u003eOver-discharge activation\u003c\/strong\u003e for protected Li-ion batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"48:1-48:136;3081-3216\"\u003e\n\u003cstrong\u003eUltra-lightweight\u003c\/strong\u003e: just 40.5g — ideal for travel, a backup charge, or topping off the 6th cell while the UMS4 handles the other 4\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"52:1-52:37;3223-3259\"\u003eSupported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"54:1-57:56;3261-3712\"\u003e\u003cstrong\u003eNITECORE UMS4\u003c\/strong\u003e — compatible with 3.6V\/3.7V Li-ion, 3.8V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH\/Ni-Cd batteries, including the Sony\/Murata VTC5 (18650) in this bundle: IMR\/Li-ion\/LiFePO4: 10440, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 Ni-MH\/Ni-Cd: AA, AAA, AAAA, C, D Output: up to 3,000mA per bay (QC mode) \/ 4,000mA total\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"59:1-61:55;3714-4099\"\u003e\u003cstrong\u003eNITECORE UI1\u003c\/strong\u003e — compatible with 3.6V\/3.7V Li-ion\/IMR batteries, including the Sony\/Murata VTC5 (18650): 10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650 Output voltage: 4.2V±1% · Output current: up to 1000mA\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"65:1-65:23;4106-4128\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"67:1-67:216;4130-4345\"\u003eBoth the UMS4 and UI1 use spring-loaded contacts that accommodate Flat Top batteries securely without any adapter. VTC5 Flat Top cells measure about 65.0mm, well within the compatible battery range of both chargers.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"71:1-71:19;4352-4370\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"73:1-77:19;4372-4539\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"73:1-73:48;4372-4419\"\u003eSony\/Murata US18650-VTC5 Flat Top Battery × 6\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"74:1-74:34;4420-4453\"\u003eNITECORE UMS4 4-Bay Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"75:1-75:39;4454-4492\"\u003eNITECORE UI1 Single-Slot Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"76:1-76:28;4493-4520\"\u003eUSB-C Charging Cables × 2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"77:1-77:19;4521-4539\"\u003eUser Manuals × 2\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"81:1-81:15;4546-4560\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"83:1-87:50;4562-5017\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"83:1-83:105;4562-4666\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"84:1-84:63;4667-4729\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"85:1-85:82;4730-4811\"\u003eCharge only with genuine, compatible chargers such as the NITECORE UMS4 and UI1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"86:1-86:156;4812-4967\"\u003eThe VTC5 is an unprotected, high-drain cell intended strictly for compatible, purpose-built devices — do not use it in unauthorized or modified equipment\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"87:1-87:50;4968-5017\"\u003eNever discharge below 2.5V or charge above 4.2V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"91:1-91:7;5024-5030\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"93:1-94:207;5032-5292\"\u003e\u003cstrong\u003eQ: Can I charge all 6 batteries at the same time?\u003c\/strong\u003e A: Yes. The UMS4 charges 4 batteries independently and simultaneously, while the UI1 can charge a 5th battery alongside it — or you can stagger the 5th and 6th through the UI1 if only one is used at a time.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"96:1-97:145;5294-5518\"\u003e\u003cstrong\u003eQ: Are Sony\/Murata VTC5 Flat Top batteries safe to charge in both chargers?\u003c\/strong\u003e A: Yes. Both the UMS4 and UI1 automatically recognize Li-ion chemistry and apply the correct charging voltage (4.2V) and current for VTC5 cells.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"99:1-100:299;5520-5888\"\u003e\u003cstrong\u003eQ: What's the difference between the UMS4 and UI1 in this bundle?\u003c\/strong\u003e A: The UMS4 is a 4-bay charger with an LCD screen showing detailed real-time data (battery health, internal resistance, voltage, capacity) and faster QC charging up to 3,000mA per bay. The UI1 is a single-slot, ultra-compact charger (40.5g) best suited for travel or charging one battery at a time.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"102:1-103:138;5890-6094\"\u003e\u003cstrong\u003eQ: Will Flat Top batteries sit properly in both charger slots?\u003c\/strong\u003e A: Yes. Both the UMS4 and UI1 have spring-loaded\/open contact designs that accommodate Flat Top and Button Top cells without any adapter.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"105:1-106:173;6096-6316\"\u003e\u003cstrong\u003eQ: How do I check if a battery is degraded?\u003c\/strong\u003e A: The UMS4's LCD display shows battery health as \"Good\" or \"Poor\" along with internal resistance readings, making it easy to spot cells that have aged or lost performance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"114:1-115:160;6875-7060\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 6 Sony\/Murata US18650-VTC5 Flat Top batteries, 1 NITECORE UMS4 charger, 1 NITECORE UI1 charger, 2 USB-C charging cables, and user manuals for both chargers.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454223352054,"sku":"OAS1737","price":120.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ums4-ui1-sony-vtc5-flat-top-6pack-bundle-main_a9934aff-60fd-4d89-9a37-a7ecbc1436c4.webp?v=1786968610"},{"product_id":"nitecore-ui2-2-slot-usb-c-charger-2x-sony-murata-us18650-vtc6-flat-top-battery-kit-3000mah-15a-high-capacity","title":"NITECORE UI2 2-Slot USB-C Charger \u0026 2x Sony\/Murata US18650-VTC6 Flat Top Battery Kit (3000mAh 15A High Capacity)","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;183-201\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:576;203-778\"\u003eThe Sony\/Murata VTC6 strikes one of the best balances in the 18650 lineup — a strong 3000mAh capacity combined with a true 15A continuous discharge rating (up to 30A with temperature-limited pulses). A cell this well-rounded deserves a charger that treats it right. This bundle pairs 2 genuine Sony\/Murata VTC6 Flat Top batteries with the NITECORE UI2 — a compact, USB-C powered charger that automatically selects the right charging mode and includes trickle charging and over-discharge protection. Everything you need to charge and maintain your cells, ready out of the box.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:54;785-838\"\u003eSony\/Murata US18650-VTC6 (Flat Top) Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-25:147;840-1529\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSony\/Murata US18650-VTC6 (Flat Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3000mAh (3120mAh typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e15A (up to 30A with temperature-limited pulses, ≤80°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.20±0.05V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDischarge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.0–2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNMC (Lithium Nickel Manganese Cobalt Oxide), high-drain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e18650 (approx.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eΦ18.35mm × 65.0mm)\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top — level positive terminal, suited for devices requiring full-surface contact\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eHigh-output flashlights, power tools, robotics, battery pack builds, and other high-capacity, high-drain applications\u003c\/td\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"27:1-27:199;1531-1729\"\u003e\u003cem\u003eNote: This is a high-drain, unprotected cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"31:1-31:29;1736-1764\"\u003eThe Charger: NITECORE UI2\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"33:1-39:69;1766-2541\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"33:1-33:113;1766-1878\"\u003e\n\u003cstrong\u003eUSB-C input\u003c\/strong\u003e: charge from any 5V power bank, solar panel, or USB adapter — great for travel and outdoor use\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"34:1-34:100;1879-1978\"\u003e\n\u003cstrong\u003eAutomatic CC\/CV Charging\u003c\/strong\u003e: intelligently selects the most suitable charging mode for each cell\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"35:1-35:105;1979-2083\"\u003e\n\u003cstrong\u003eIndependent Dual-Bay Control\u003c\/strong\u003e: each of the 2 bays charges independently without affecting the other\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"36:1-36:142;2084-2225\"\u003e\n\u003cstrong\u003eTrickle Charging\u003c\/strong\u003e: automatically switches to 100mA trickle mode for batteries below 2.9V, then up to 1000mA standard charging above 2.9V\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"37:1-37:110;2226-2335\"\u003e\n\u003cstrong\u003eOver-Discharge Activation\u003c\/strong\u003e: automatically detects and reactivates over-discharged protected Li-ion cells\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"38:1-38:137;2336-2472\"\u003e\n\u003cstrong\u003eMultiple Safety Protections\u003c\/strong\u003e: reverse-polarity\/short-circuit protection, intelligent temperature control, and overcharge protection\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"39:1-39:69;2473-2541\"\u003e\n\u003cstrong\u003eUltra-Compact \u0026amp; Lightweight\u003c\/strong\u003e: just 79.5g, 125.5 × 59.5 × 32.1mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"43:1-43:52;2548-2599\"\u003eNITECORE UI2 – Supported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"45:1-45:99;2601-2699\"\u003e\u003cstrong\u003eCharges 3.6V\/3.7V Li-ion\/IMR batteries\u003c\/strong\u003e, including the Sony\/Murata VTC6 (18650) in this bundle:\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"47:1-47:225;2701-2925\"\u003e10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"49:1-50:69;2927-3023\"\u003e\u003cstrong\u003eOutput voltage:\u003c\/strong\u003e 4.2V±1% \u003cstrong\u003eOutput current:\u003c\/strong\u003e up to 1000mA per bay (max 2 bays simultaneously)\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"54:1-54:23;3030-3052\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"56:1-56:196;3054-3249\"\u003eThe UI2's charging bays are open-ended, allowing Flat Top batteries to seat securely without any adapter. VTC6 Flat Top cells measure about 65.0mm, well within the UI2's compatible battery range.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"60:1-60:19;3256-3274\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"62:1-65:18;3276-3395\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"62:1-62:48;3276-3323\"\u003eSony\/Murata US18650-VTC6 Flat Top Battery × 2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"63:1-63:27;3324-3350\"\u003eNITECORE UI2 Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"64:1-64:27;3351-3377\"\u003eUSB-C Charging Cable × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"65:1-65:18;3378-3395\"\u003eUser Manual × 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"69:1-69:15;3402-3416\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"71:1-75:50;3418-3856\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"71:1-71:105;3418-3522\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"72:1-72:63;3523-3585\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"73:1-73:74;3586-3659\"\u003eCharge only with a genuine, compatible charger such as the NITECORE UI2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"74:1-74:147;3660-3806\"\u003eThe VTC6 is an unprotected, high-drain cell intended for compatible, purpose-built devices — do not use it in unauthorized or modified equipment\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"75:1-75:50;3807-3856\"\u003eNever discharge below 2.0V or charge above 4.2V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"79:1-79:7;3863-3869\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"81:1-82:158;3871-4107\"\u003e\u003cstrong\u003eQ: Can the NITECORE UI2 charge Sony\/Murata VTC6 Flat Top batteries safely?\u003c\/strong\u003e A: Yes. The UI2 automatically selects the optimal CC\/CV charging mode for Li-ion cells like the VTC6, with a 4.2V±1% output voltage and up to 1000mA per bay.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"84:1-85:137;4109-4314\"\u003e\u003cstrong\u003eQ: Will Flat Top batteries sit properly in the UI2 charger bays?\u003c\/strong\u003e A: Yes. The UI2's open charging bays are designed to accommodate both Flat Top and Button Top cells without any adapter or modification.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"87:1-88:131;4316-4499\"\u003e\u003cstrong\u003eQ: Can I charge both batteries at the same time?\u003c\/strong\u003e A: Yes. The UI2 has 2 independent bays, each capable of up to 1000mA, and one battery's charging status does not affect the other.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"90:1-91:130;4501-4692\"\u003e\u003cstrong\u003eQ: Can I power the UI2 with a power bank while traveling?\u003c\/strong\u003e A: Yes. The UI2 has a USB-C input and works with any 5V power source, including power banks, solar panels, and USB wall adapters.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"93:1-94:298;4694-5050\"\u003e\u003cstrong\u003eQ: What happens if a VTC6 battery has over-discharged?\u003c\/strong\u003e A: The UI2 includes an over-discharge activation feature that automatically detects and reactivates protected Li-ion cells that have dropped too low from storage or improper use. Note that the VTC6 is an unprotected cell, so always avoid discharging it below its cutoff voltage in the first place.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"96:1-97:252;5052-5377\"\u003e\u003cstrong\u003eQ: Is 15A (up to 30A) continuous discharge safe for everyday devices?\u003c\/strong\u003e A: No — the VTC6 is a high-drain cell intended strictly for devices specifically engineered for high continuous discharge, such as certain high-output flashlights, and power tools. Always check your device's battery requirements before use.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"99:1-100:231;5379-5655\"\u003e\u003cstrong\u003eQ: How does the VTC6 compare to the VTC5?\u003c\/strong\u003e A: The VTC6 offers higher capacity (3000mAh vs. 2600mAh) at a lower continuous discharge rating (15A vs. 20A). It's the better pick for longer runtime, while the VTC5 is better suited to the most extreme high-current applications.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"102:1-103:117;5657-5799\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 2 Sony\/Murata US18650-VTC6 Flat Top batteries, 1 NITECORE UI2 charger, a USB-C charging cable, and a user manual.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454223417590,"sku":"OAS1739","price":30.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ui2-sony-vtc6-flat-top-2pack-kit-main_8dfc9300-823b-4e68-b3f7-5e395032a0ba.webp?v=1786968614"},{"product_id":"nitecore-ums4-4-slot-smart-charger-4x-sony-murata-us18650-vtc6-flat-top-battery-kit-3000mah-15a-high-capacity","title":"NITECORE UMS4 4-Slot Smart Charger \u0026 4x Sony\/Murata US18650-VTC6 Flat Top Battery Kit (3000mAh 15A High Capacity)","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;191-209\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:560;211-770\"\u003eThe Sony\/Murata VTC6 strikes one of the best balances in the 18650 lineup — a strong 3000mAh capacity combined with a true 15A continuous discharge rating (up to 30A with temperature-limited pulses). A set this capable deserves a charger that can handle every cell at once while keeping close watch on their health. This bundle pairs 4 genuine Sony\/Murata VTC6 Flat Top batteries with the NITECORE UMS4, a QC-enabled 4-slot charger with a detailed LCD display, independent bay control, and multiple layers of protection — ready to use straight out of the box.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:54;777-830\"\u003eSony\/Murata US18650-VTC6 (Flat Top) Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-25:147;832-1521\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSony\/Murata US18650-VTC6 (Flat Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3000mAh (3120mAh typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e15A (up to 30A with temperature-limited pulses, ≤80°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.20±0.05V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDischarge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.0–2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNMC (Lithium Nickel Manganese Cobalt Oxide), high-drain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e18650 (approx.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eΦ18.35mm × 65.0mm)\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top — level positive terminal, suited for devices requiring full-surface contact\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eHigh-output flashlights, power tools, robotics, battery pack builds, and other high-capacity, high-drain applications\u003c\/td\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"27:1-27:199;1523-1721\"\u003e\u003cem\u003eNote: This is a high-drain, unprotected cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"31:1-31:30;1728-1757\"\u003eThe Charger: NITECORE UMS4\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"33:1-41:95;1759-2865\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"33:1-33:111;1759-1869\"\u003e\n\u003cstrong\u003eUSB-C input with QC support\u003c\/strong\u003e: up to 4,000mA total output; up to 3,000mA on a single bay with a QC adapter\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"34:1-34:109;1870-1978\"\u003e\n\u003cstrong\u003eQC Mode output\u003c\/strong\u003e: 3,000mA×1 \/ 2,000mA×2 \/ 1,000mA×4 — \u003cstrong\u003eStandard Mode\u003c\/strong\u003e: 2,000mA×1 \/ 1,000mA×2 \/ 500mA×4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"35:1-35:121;1979-2099\"\u003e\n\u003cstrong\u003eIndependent 4-bay control\u003c\/strong\u003e: charge and monitor up to 4 batteries separately, with each bay unaffected by the others\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"36:1-36:202;2100-2301\"\u003e\n\u003cstrong\u003eDetailed real-time LCD display\u003c\/strong\u003e: shows battery health (Good\/Poor), internal resistance, charging current, voltage, battery type, charged capacity, charging time, cut-off voltage, and charging mode\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"37:1-37:116;2302-2417\"\u003e\n\u003cstrong\u003e3 automatic charging modes\u003c\/strong\u003e: CC, CV, and -dV\/dt, selected automatically based on battery type and charge level\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"38:1-38:88;2418-2505\"\u003e\n\u003cstrong\u003eManual adjustment\u003c\/strong\u003e: set charging voltage and current for specialized battery types\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"39:1-39:192;2506-2697\"\u003e\n\u003cstrong\u003eSafety features\u003c\/strong\u003e: automatic internal resistance detection, reverse-polarity and short-circuit protection, overtime charging protection, and over-discharged battery activation\/restoration\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"40:1-40:73;2698-2770\"\u003e\n\u003cstrong\u003eFire-retardant PC\/ABS housing\u003c\/strong\u003e with built-in temperature regulation\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"41:1-41:95;2771-2865\"\u003e\n\u003cstrong\u003eUniversal power input\u003c\/strong\u003e: works with wall adapters, power banks, and solar panels via USB-C\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"45:1-45:53;2872-2924\"\u003eNITECORE UMS4 – Supported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"47:1-47:152;2926-3077\"\u003e\u003cstrong\u003eCompatible with 3.6V\/3.7V Li-ion, 3.8V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH\/Ni-Cd batteries\u003c\/strong\u003e, including the Sony\/Murata VTC6 (18650) in this bundle:\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"49:1-50:33;3079-3307\"\u003eIMR\/Li-ion\/LiFePO4: 10440, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 Ni-MH\/Ni-Cd: AA, AAA, AAAA, C, D\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"52:1-52:68;3309-3376\"\u003e\u003cstrong\u003eOutput current:\u003c\/strong\u003e up to 3,000mA per bay (QC mode) \/ 4,000mA total\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"56:1-56:23;3383-3405\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"58:1-58:292;3407-3698\"\u003eThe UMS4 uses spring-loaded contacts that accommodate Flat Top batteries securely without any adapter. VTC6 Flat Top cells measure about 65.0mm, well within the UMS4's compatible battery range. All 4 cells in this bundle can be charged simultaneously across the charger's 4 independent bays.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"62:1-62:19;3705-3723\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"64:1-67:18;3725-3851\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"64:1-64:48;3725-3772\"\u003eSony\/Murata US18650-VTC6 Flat Top Battery × 4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"65:1-65:34;3773-3806\"\u003eNITECORE UMS4 4-Bay Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"66:1-66:27;3807-3833\"\u003eUSB-C Charging Cable × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"67:1-67:18;3834-3851\"\u003eUser Manual × 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"71:1-71:15;3858-3872\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"73:1-78:187;3874-4509\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"73:1-73:105;3874-3978\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"74:1-74:63;3979-4041\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"75:1-75:75;4042-4116\"\u003eCharge only with a genuine, compatible charger such as the NITECORE UMS4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"76:1-76:156;4117-4272\"\u003eThe VTC6 is an unprotected, high-drain cell intended strictly for compatible, purpose-built devices — do not use it in unauthorized or modified equipment\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"77:1-77:50;4273-4322\"\u003eNever discharge below 2.0V or charge above 4.2V\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"78:1-78:187;4323-4509\"\u003eFlat Top batteries are commonly used in devices with spring or flat-contact battery holders (e.g., battery packs and power tools) — check your device's terminal requirements before use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"82:1-82:7;4516-4522\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"84:1-85:178;4524-4781\"\u003e\u003cstrong\u003eQ: Can the NITECORE UMS4 charge Sony\/Murata VTC6 Flat Top batteries safely?\u003c\/strong\u003e A: Yes. The UMS4 automatically detects Li-ion chemistry and applies the correct charging voltage (4.2V) and current for VTC6 cells, with real-time monitoring on its LCD display.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"87:1-88:188;4783-5024\"\u003e\u003cstrong\u003eQ: Can I charge all 4 batteries at the same time?\u003c\/strong\u003e A: Yes. The UMS4 has 4 independent bays and can charge all 4 cells simultaneously — up to 1,000mA per bay in QC mode, or 500mA per bay in standard mode, when all 4 slots are used at once.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"90:1-91:142;5026-5237\"\u003e\u003cstrong\u003eQ: Will Flat Top batteries sit properly in the UMS4 charger bays?\u003c\/strong\u003e A: Yes. The UMS4's spring-loaded contacts are designed to accommodate both Flat Top and Button Top cells without any adapter or modification.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"93:1-94:173;5239-5463\"\u003e\u003cstrong\u003eQ: How do I know if a VTC6 battery is degraded?\u003c\/strong\u003e A: The UMS4's LCD display shows battery health as \"Good\" or \"Poor\" along with internal resistance readings, making it easy to spot cells that have aged or lost performance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"96:1-97:252;5465-5790\"\u003e\u003cstrong\u003eQ: Is 15A (up to 30A) continuous discharge safe for everyday devices?\u003c\/strong\u003e A: No — the VTC6 is a high-drain cell intended strictly for devices specifically engineered for high continuous discharge, such as certain high-output flashlights, and power tools. Always check your device's battery requirements before use.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"99:1-100:96;5792-5950\"\u003e\u003cstrong\u003eQ: Can I power the UMS4 with a power bank while traveling?\u003c\/strong\u003e A: Yes. The UMS4 has a USB-C input and works with wall adapters, power banks, and solar panels.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"102:1-103:231;5952-6228\"\u003e\u003cstrong\u003eQ: How does the VTC6 compare to the VTC5?\u003c\/strong\u003e A: The VTC6 offers higher capacity (3000mAh vs. 2600mAh) at a lower continuous discharge rating (15A vs. 20A). It's the better pick for longer runtime, while the VTC5 is better suited to the most extreme high-current applications.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"105:1-106:118;6230-6373\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 4 Sony\/Murata US18650-VTC6 Flat Top batteries, 1 NITECORE UMS4 charger, a USB-C charging cable, and a user manual.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454223450358,"sku":"OAS1740","price":99.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ums4-sony-vtc6-flat-top-4pack-kit-main_6a077906-206a-4c2e-96fa-c21688e88a80.webp?v=1786968618"},{"product_id":"nitecore-ums4-4-slot-charger-ui1-portable-charger-6x-sony-murata-us18650-vtc6-flat-top-battery-kit-3000mah-15a-high-capacity","title":"NITECORE UMS4 4-Slot Charger + UI1 Portable Charger \u0026 6x Sony\/Murata US18650-VTC6 Flat Top Battery Kit (3000mAh 15A High Capacity)","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;203-221\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:701;223-923\"\u003eThe Sony\/Murata VTC6 strikes one of the best balances in the 18650 lineup — a strong 3000mAh capacity combined with a true 15A continuous discharge rating (up to 30A with temperature-limited pulses). Six of these cells need a charging setup that can keep up — at home and on the go. This bundle pairs 6 genuine Sony\/Murata VTC6 Flat Top batteries with the NITECORE UMS4 (a 4-bay smart LCD charger for fast, monitored charging at your desk) and the NITECORE UI1 (an ultra-compact single-slot charger for travel or topping off a spare cell). Together, all 6 batteries can be charged at once — 4 in the UMS4, and the 5th and 6th staggered through the UI1 — with full visibility into every cell's health.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:54;930-983\"\u003eSony\/Murata US18650-VTC6 (Flat Top) Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-25:147;985-1674\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSony\/Murata US18650-VTC6 (Flat Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3000mAh (3120mAh typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e15A (up to 30A with temperature-limited pulses, ≤80°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.20±0.05V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDischarge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.0–2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNMC (Lithium Nickel Manganese Cobalt Oxide), high-drain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e18650 (approx.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eΦ18.35mm × 65.0mm)\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top — level positive terminal, suited for devices requiring full-surface contact\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eHigh-output flashlights, power tools, robotics, battery pack builds, and other high-capacity, high-drain applications\u003c\/td\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"27:1-27:199;1676-1874\"\u003e\u003cem\u003eNote: This is a high-drain, unprotected cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"31:1-31:46;1881-1926\"\u003eThe Chargers: NITECORE UMS4 + NITECORE UI1\u003c\/h2\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"33:1-33:44;1928-1971\"\u003eNITECORE UMS4 — 4-Bay Smart LCD Charger\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"34:1-40:73;1972-2789\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"34:1-34:111;1972-2082\"\u003e\n\u003cstrong\u003eUSB-C input with QC support\u003c\/strong\u003e: up to 4,000mA total output, up to 3,000mA on a single bay with a QC adapter\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"35:1-35:76;2083-2158\"\u003e\n\u003cstrong\u003eIndependent 4-bay control\u003c\/strong\u003e: charge and monitor each battery separately\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"36:1-36:147;2159-2305\"\u003e\n\u003cstrong\u003eReal-time LCD display\u003c\/strong\u003e: shows battery health (Good\/Poor), internal resistance, charging current, voltage, charged capacity, and charging time\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"37:1-37:116;2306-2421\"\u003e\n\u003cstrong\u003e3 automatic charging modes\u003c\/strong\u003e: CC, CV, and -dV\/dt, selected automatically based on battery type and charge level\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"38:1-38:103;2422-2524\"\u003e\n\u003cstrong\u003eManual adjustment\u003c\/strong\u003e: set charging voltage and current (300mA–3000mA) for specialized battery types\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"39:1-39:192;2525-2716\"\u003e\n\u003cstrong\u003eSafety features\u003c\/strong\u003e: automatic internal resistance detection, reverse-polarity and short-circuit protection, overtime charging protection, and over-discharged battery activation\/restoration\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"40:1-40:73;2717-2789\"\u003e\n\u003cstrong\u003eFire-retardant PC\/ABS housing\u003c\/strong\u003e with built-in temperature regulation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"42:1-42:47;2791-2837\"\u003eNITECORE UI1 — Compact Single-Slot Charger\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"43:1-47:136;2838-3307\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"43:1-43:126;2838-2963\"\u003e\n\u003cstrong\u003eType-C input\u003c\/strong\u003e: automatically adapts to the optimal charging mode, works with power banks, solar panels, and USB adapters\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"44:1-44:62;2964-3025\"\u003e\n\u003cstrong\u003eUp to 1000mA output\u003c\/strong\u003e with automatic CC\/CV mode selection\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"45:1-45:83;3026-3108\"\u003e\n\u003cstrong\u003eTrickle charging\u003c\/strong\u003e protects over-discharged cells and extends battery lifespan\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"46:1-46:63;3109-3171\"\u003e\n\u003cstrong\u003eOver-discharge activation\u003c\/strong\u003e for protected Li-ion batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"47:1-47:136;3172-3307\"\u003e\n\u003cstrong\u003eUltra-lightweight\u003c\/strong\u003e: just 40.5g — ideal for travel, a backup charge, or topping off the 6th cell while the UMS4 handles the other 4\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"51:1-51:37;3314-3350\"\u003eSupported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"53:1-56:56;3352-3803\"\u003e\u003cstrong\u003eNITECORE UMS4\u003c\/strong\u003e — compatible with 3.6V\/3.7V Li-ion, 3.8V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH\/Ni-Cd batteries, including the Sony\/Murata VTC6 (18650) in this bundle: IMR\/Li-ion\/LiFePO4: 10440, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 Ni-MH\/Ni-Cd: AA, AAA, AAAA, C, D Output: up to 3,000mA per bay (QC mode) \/ 4,000mA total\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"58:1-60:55;3805-4190\"\u003e\u003cstrong\u003eNITECORE UI1\u003c\/strong\u003e — compatible with 3.6V\/3.7V Li-ion\/IMR batteries, including the Sony\/Murata VTC6 (18650): 10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650 Output voltage: 4.2V±1% · Output current: up to 1000mA\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"64:1-64:23;4197-4219\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"66:1-66:216;4221-4436\"\u003eBoth the UMS4 and UI1 use spring-loaded contacts that accommodate Flat Top batteries securely without any adapter. VTC6 Flat Top cells measure about 65.0mm, well within the compatible battery range of both chargers.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"70:1-70:19;4443-4461\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"72:1-76:19;4463-4630\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"72:1-72:48;4463-4510\"\u003eSony\/Murata US18650-VTC6 Flat Top Battery × 6\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"73:1-73:34;4511-4544\"\u003eNITECORE UMS4 4-Bay Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"74:1-74:39;4545-4583\"\u003eNITECORE UI1 Single-Slot Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"75:1-75:28;4584-4611\"\u003eUSB-C Charging Cables × 2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"76:1-76:19;4612-4630\"\u003eUser Manuals × 2\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"80:1-80:15;4637-4651\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"82:1-86:50;4653-5108\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"82:1-82:105;4653-4757\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"83:1-83:63;4758-4820\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"84:1-84:82;4821-4902\"\u003eCharge only with genuine, compatible chargers such as the NITECORE UMS4 and UI1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"85:1-85:156;4903-5058\"\u003eThe VTC6 is an unprotected, high-drain cell intended strictly for compatible, purpose-built devices — do not use it in unauthorized or modified equipment\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"86:1-86:50;5059-5108\"\u003eNever discharge below 2.0V or charge above 4.2V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"90:1-90:7;5115-5121\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"92:1-93:207;5123-5383\"\u003e\u003cstrong\u003eQ: Can I charge all 6 batteries at the same time?\u003c\/strong\u003e A: Yes. The UMS4 charges 4 batteries independently and simultaneously, while the UI1 can charge a 5th battery alongside it — or you can stagger the 5th and 6th through the UI1 if only one is used at a time.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"95:1-96:145;5385-5609\"\u003e\u003cstrong\u003eQ: Are Sony\/Murata VTC6 Flat Top batteries safe to charge in both chargers?\u003c\/strong\u003e A: Yes. Both the UMS4 and UI1 automatically recognize Li-ion chemistry and apply the correct charging voltage (4.2V) and current for VTC6 cells.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"98:1-99:299;5611-5979\"\u003e\u003cstrong\u003eQ: What's the difference between the UMS4 and UI1 in this bundle?\u003c\/strong\u003e A: The UMS4 is a 4-bay charger with an LCD screen showing detailed real-time data (battery health, internal resistance, voltage, capacity) and faster QC charging up to 3,000mA per bay. The UI1 is a single-slot, ultra-compact charger (40.5g) best suited for travel or charging one battery at a time.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"101:1-102:138;5981-6185\"\u003e\u003cstrong\u003eQ: Will Flat Top batteries sit properly in both charger slots?\u003c\/strong\u003e A: Yes. Both the UMS4 and UI1 have spring-loaded\/open contact designs that accommodate Flat Top and Button Top cells without any adapter.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"104:1-105:173;6187-6407\"\u003e\u003cstrong\u003eQ: How do I check if a battery is degraded?\u003c\/strong\u003e A: The UMS4's LCD display shows battery health as \"Good\" or \"Poor\" along with internal resistance readings, making it easy to spot cells that have aged or lost performance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"107:1-108:252;6409-6734\"\u003e\u003cstrong\u003eQ: Is 15A (up to 30A) continuous discharge safe for everyday devices?\u003c\/strong\u003e A: No — the VTC6 is a high-drain cell intended strictly for devices specifically engineered for high continuous discharge, such as certain  high-output flashlights, and power tools. Always check your device's battery requirements before use.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"110:1-111:231;6736-7012\"\u003e\u003cstrong\u003eQ: How does the VTC6 compare to the VTC5?\u003c\/strong\u003e A: The VTC6 offers higher capacity (3000mAh vs. 2600mAh) at a lower continuous discharge rating (15A vs. 20A). It's the better pick for longer runtime, while the VTC5 is better suited to the most extreme high-current applications.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"113:1-114:160;7014-7199\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 6 Sony\/Murata US18650-VTC6 Flat Top batteries, 1 NITECORE UMS4 charger, 1 NITECORE UI1 charger, 2 USB-C charging cables, and user manuals for both chargers.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454223515894,"sku":"OAS1741","price":129.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ums4-ui1-sony-vtc6-flat-top-6pack-bundle-main_2c8cd4e1-da8a-4c5b-bd0c-6a95b5289cd1.webp?v=1786968623"},{"product_id":"nitecore-um2-2-slot-smart-battery-charger-with-lcd-display-qc-pd-fast-charging-for-18650-21700-26650-li-ion-batteries","title":"NITECORE UM2 2-Slot Smart Battery Charger with LCD Display – QC\/PD Fast Charging for 18650, 21700, 26650 Li-ion Batteries","description":"\u003ch2\u003e\u003cspan class=\"\"\u003eProduct Description\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eNITECORE UM2\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e is a premium intelligent dual-slot USB-C battery charger designed for safety, speed, and versatility.\u003c\/span\u003e\u003cspan class=\"\"\u003e Whether you are a professional flashlight user, an outdoor enthusiast, or a DIY electronics builder, the UM2 delivers unparalleled charging performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eEquipped with a high-definition \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eLCD display\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e, the UM2 allows you to monitor real-time charging status, including battery voltage, charging current, charged capacity, and elapsed time. \u003c\/span\u003e\u003cspan class=\"\"\u003eIt supports \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQC 2.0 fast input\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e and provides a maximum output of \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e1500mA per slot\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e (3000mA total).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eThe UM2 is not just a charger—it’s a battery life saver. \u003c\/span\u003e\u003cspan class=\"\"\u003eIt features \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eIMR battery repair and activation functions\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e, helping you revive over-discharged lithium batteries.\u003c\/span\u003e\u003cspan class=\"\"\u003e With multiple safety protections, including reverse polarity, short-circuit prevention, and a built-in intelligent temperature control system, your batteries are always in safe hands.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eIntelligent Dual-Slot Charging:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Two independent charging slots with a total output of 3000mA (1500mA per slot).\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eHigh-Definition LCD Display:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Real-time monitoring of charging current, voltage, capacity, and time.\u003c\/span\u003e\u003cspan class=\"\"\u003e The screen automatically dims after 10 minutes to save power.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQC 2.0 Fast Charging:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Supports Quick Charge 2.0 input for significantly reduced charging times.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eBattery Activation \u0026amp; Repair:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Automatically detects and activates over-discharged IMR\/Li-ion batteries.\u003c\/span\u003e\u003cspan class=\"\"\u003e Displays \"EE\" when a battery is beyond repair.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e3 Charging Modes:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Automatically selects CC (Constant Current), CV (Constant Voltage), and -dV\/dt (for NiMH\/NiCd) modes based on battery chemistry.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eManual Setting:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Long-press the \"C\" button to manually adjust charging voltage (3.7V\/4.2V\/4.3V) and current (100mA ~ 1500mA).\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eUSB-C Input:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Powered via USB-C, compatible with power banks, solar panels, USB adapters, and laptops.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eAdvanced Safety Protection:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Features reverse polarity protection, short-circuit protection, overcharge cut-off, and full-automatic smart temperature control.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eUnique Heat Dissipation Design:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Built-in cooling fins on both sides ensure stable charging by preventing heat buildup.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eFire-Resistant Material:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Manufactured with PC flame-retardant materials for maximum safety.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eParameters (Specifications)\u003c\/span\u003e\u003c\/h2\u003e\n\u003cdiv class=\"ds-scroll-area ds-scroll-area--show-on-focus-within ds-scroll-area--enabled _1210dd7 c03cafe9\"\u003e\n\u003cdiv class=\"ds-scroll-area__gutters\"\u003e\n\u003cdiv class=\"ds-scroll-area__horizontal-gutter\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"ds-scroll-area__vertical-gutter\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctr\u003e\n\u003cth\u003e\u003cspan class=\"\"\u003eParameter\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan class=\"\"\u003eSpecification\u003c\/span\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eInput Voltage\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eDC 5V\/2A, 9V\/2A (QC 2.0)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eInput Power\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e18W (Max)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eOutput Voltage\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e4.35V ±1% \/ 4.2V ±1% \/ 3.7V ±1% \/ 1.48V ±1%\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eOutput Current\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eFast Charge Mode: 1500mA × 2 (Max)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eStandard Mode: 1000mA × 2 (Max)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eCompatible Batteries (Li-ion)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e3.6\/3.7V IMR\/Li-ion\/3.2V LiFePO4: 10440, 14500, 14650, 16500, 16340, 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eCompatible Batteries (NiMH\/NiCd)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e1.2V AA, AAA, AAAA, C, D\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eDimensions\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e152mm × 73mm × 40mm (5.98\" × 2.87\" × 1.57\")\u003c\/span\u003e\u003c\/td\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003cstrong\u003e\u003cspan class=\"\"\u003eWeight\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e148.3g (5.23oz) (Without charging cable)\u003c\/span\u003e\n\u003cbr\u003e\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eEveryday Carry (EDC):\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Perfect for charging 18650 and 21700 batteries used in high-performance flashlights and headlamps.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eOutdoor Adventures:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e USB-C input allows you to charge batteries via solar panels or power banks during camping, hiking, or emergency situations.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eDIY Electronics \u0026amp; Power Banks:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Ideal for hobbyists building custom battery packs or using NiMH\/NiCd cells for RC devices.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eIndustrial \u0026amp; Professional Use:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Reliable charging for cordless power tools, security cameras, and medical devices.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eFAQ \u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ1: What is the difference between Fast Charge Mode and Standard Mode?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eA:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e In Fast Charge Mode, the UM2 outputs 1500mA per slot for faster charging (up to 18W total).\u003c\/span\u003e\u003cspan class=\"\"\u003e In Standard Mode, it outputs 1000mA per slot, which is gentler on batteries and suitable for overnight charging.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ2: What does the \"EE\" error display mean?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eA:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e The \"EE\" display indicates that the battery is either damaged, has a short circuit, or is over-discharged beyond the safe repair threshold. For over-discharged IMR batteries, you can long-press the \"V\" button to attempt repair mode.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ3: Can I charge NiMH and Li-ion batteries at the same time?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eA:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Yes, the UM2 has two independent slots.\u003c\/span\u003e\u003cspan class=\"\"\u003e You can charge different battery chemistries (Li-ion, NiMH, NiCd) simultaneously without interference.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ4: Does the UM2 support USB-C to USB-C charging?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eA:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Yes, the UM2 uses a USB-C port.\u003c\/span\u003e\u003cspan class=\"\"\u003e You can power it using a standard USB-C cable connected to a compatible QC 2.0 wall adapter, power bank, or laptop.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ5: How long does it take to charge a 3500mAh battery?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eA:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e In Fast Charge Mode (1500mA), charging a 3500mAh battery to 80% takes approximately 2 hours.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\u003cbr\u003e ","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454224072950,"sku":"OAS1353","price":39.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-um2-main-hero-dual-slot-charger_7815ce3c-9f8b-4b2a-ac71-0c04fc2269d7.webp?v=1786968664"},{"product_id":"samsung-inr21700-50e-5000mah-10a-21700-battery-4-pack-with-nitecore-ums4-smart-charger-high-capacity-power-kit-with-lcd-control-for-rv-power-off-grid-storage-field-communications","title":"Samsung INR21700-50E 5000mAh 10A 21700 Battery 4-Pack with Nitecore UMS4 Smart Charger – High-Capacity Power Kit with LCD Control for RV Power, Off-Grid Storage \u0026 Field Communications","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;167-185\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:576;187-762\"\u003eThe Samsung 50E is a high-energy 21700 cell built for runtime, not extreme current — a genuine 5000mAh capacity in a moderate-drain package that's a common choice for e-bikes, power tools, and long-runtime battery packs. A set this capable deserves a charger that can handle every cell at once while keeping close watch on their health. This bundle pairs 4 genuine Samsung INR21700-50E batteries with the NITECORE UMS4, a QC-enabled 4-slot charger with a detailed LCD display, independent bay control, and multiple layers of protection — ready to use straight out of the box.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:39;769-807\"\u003eSamsung INR21700-50E Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-29:115;809-1495\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSamsung INR21700-50E (Flat Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e5000mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMinimum\/Rated Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4900mAh (standard) \/ 4753mAh (rated, 1C discharge)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e9.8A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eStandard Charge Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.45A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMaximum Charge Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.9A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.20V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDischarge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eLi-ion, energy-focused\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e21700 (approx. Φ20.25mm × 70.8mm, max weight 69g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eProtection Circuit\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNone (unprotected cell)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eE-bikes, power tools, drones, energy storage systems, robotics, professional battery pack builds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"31:1-31:293;1497-1789\"\u003e\u003cem\u003eNote: Samsung's own product positioning specifies the 50E for ESS, power tools, drones, medical devices, robots, and EV applications — and explicitly notes it is not intended for e-cigarettes, flashlights, RC cars, or electric skateboards. It's an energy\/runtime cell, not a high-drain one.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"33:1-33:182;1791-1972\"\u003e\u003cem\u003eThis is an unprotected cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"37:1-37:30;1979-2008\"\u003eThe Charger: NITECORE UMS4\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"39:1-47:95;2010-3116\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"39:1-39:111;2010-2120\"\u003e\n\u003cstrong\u003eUSB-C input with QC support\u003c\/strong\u003e: up to 4,000mA total output; up to 3,000mA on a single bay with a QC adapter\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"40:1-40:109;2121-2229\"\u003e\n\u003cstrong\u003eQC Mode output\u003c\/strong\u003e: 3,000mA×1 \/ 2,000mA×2 \/ 1,000mA×4 — \u003cstrong\u003eStandard Mode\u003c\/strong\u003e: 2,000mA×1 \/ 1,000mA×2 \/ 500mA×4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"41:1-41:121;2230-2350\"\u003e\n\u003cstrong\u003eIndependent 4-bay control\u003c\/strong\u003e: charge and monitor up to 4 batteries separately, with each bay unaffected by the others\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"42:1-42:202;2351-2552\"\u003e\n\u003cstrong\u003eDetailed real-time LCD display\u003c\/strong\u003e: shows battery health (Good\/Poor), internal resistance, charging current, voltage, battery type, charged capacity, charging time, cut-off voltage, and charging mode\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"43:1-43:116;2553-2668\"\u003e\n\u003cstrong\u003e3 automatic charging modes\u003c\/strong\u003e: CC, CV, and -dV\/dt, selected automatically based on battery type and charge level\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"44:1-44:88;2669-2756\"\u003e\n\u003cstrong\u003eManual adjustment\u003c\/strong\u003e: set charging voltage and current for specialized battery types\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"45:1-45:192;2757-2948\"\u003e\n\u003cstrong\u003eSafety features\u003c\/strong\u003e: automatic internal resistance detection, reverse-polarity and short-circuit protection, overtime charging protection, and over-discharged battery activation\/restoration\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"46:1-46:73;2949-3021\"\u003e\n\u003cstrong\u003eFire-retardant PC\/ABS housing\u003c\/strong\u003e with built-in temperature regulation\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"47:1-47:95;3022-3116\"\u003e\n\u003cstrong\u003eUniversal power input\u003c\/strong\u003e: works with wall adapters, power banks, and solar panels via USB-C\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"51:1-51:53;3123-3175\"\u003eNITECORE UMS4 – Supported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"53:1-53:147;3177-3323\"\u003e\u003cstrong\u003eCompatible with 3.6V\/3.7V Li-ion, 3.8V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH\/Ni-Cd batteries\u003c\/strong\u003e, including the Samsung 50E (21700) in this bundle:\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"55:1-56:33;3325-3553\"\u003eIMR\/Li-ion\/LiFePO4: 10440, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 Ni-MH\/Ni-Cd: AA, AAA, AAAA, C, D\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"58:1-58:68;3555-3622\"\u003e\u003cstrong\u003eOutput current:\u003c\/strong\u003e up to 3,000mA per bay (QC mode) \/ 4,000mA total\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"62:1-62:23;3629-3651\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"64:1-64:375;3653-4027\"\u003eThe UMS4 uses spring-loaded contacts and its bays are sized to comfortably fit 21700 cells like the 50E. Unlike a basic dual-slot travel charger, the UMS4's per-bay output (up to 3,000mA with a QC adapter on a single bay) lines up much more closely with the 50E's 2.45A standard charge current, making full charges considerably faster than a low-current charger would allow.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"66:1-66:223;4029-4251\"\u003e\u003cem\u003eNote: With all 4 bays occupied, each will charge more gently at up to 1,000mA (QC mode) or 500mA (standard mode) — still slower than the 50E's max 4.9A rating, but a reasonable, safe charging pace for four cells at once.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"70:1-70:19;4258-4276\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"72:1-75:18;4278-4391\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"72:1-72:35;4278-4312\"\u003eSamsung INR21700-50E Battery × 4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"73:1-73:34;4313-4346\"\u003eNITECORE UMS4 4-Bay Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"74:1-74:27;4347-4373\"\u003eUSB-C Charging Cable × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"75:1-75:18;4374-4391\"\u003eUser Manual × 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"79:1-79:15;4398-4412\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"81:1-85:50;4414-4930\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"81:1-81:105;4414-4518\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"82:1-82:63;4519-4581\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"83:1-83:75;4582-4656\"\u003eCharge only with a genuine, compatible charger such as the NITECORE UMS4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"84:1-84:224;4657-4880\"\u003eThe 50E is an unprotected cell intended for compatible, purpose-built devices such as e-bikes, power tools, and engineered battery packs — it is not intended for e-cigarettes, flashlights, RC cars, or electric skateboards\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"85:1-85:50;4881-4930\"\u003eNever discharge below 2.5V or charge above 4.2V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"89:1-89:7;4937-4943\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"91:1-92:279;4945-5289\"\u003e\u003cstrong\u003eQ: Can the NITECORE UMS4 charge Samsung 50E batteries safely?\u003c\/strong\u003e A: Yes. The UMS4 automatically detects Li-ion chemistry and applies the correct charging voltage (4.2V) and current for 50E cells, with real-time monitoring on its LCD display, and its higher per-bay output charges these cells noticeably faster than a basic low-current charger.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"94:1-95:253;5291-5608\"\u003e\u003cstrong\u003eQ: Is the Samsung 50E suitable for  flashlights?\u003c\/strong\u003e A: No. Samsung's own product positioning explicitly states this cell is not intended for flashlights, RC cars, or electric skateboards. It's built for e-bikes, power tools, drones, energy storage, and similar runtime-focused applications.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"97:1-98:188;5610-5851\"\u003e\u003cstrong\u003eQ: Can I charge all 4 batteries at the same time?\u003c\/strong\u003e A: Yes. The UMS4 has 4 independent bays and can charge all 4 cells simultaneously — up to 1,000mA per bay in QC mode, or 500mA per bay in standard mode, when all 4 slots are used at once.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"100:1-101:122;5853-6028\"\u003e\u003cstrong\u003eQ: Will 21700 batteries fit properly in the UMS4?\u003c\/strong\u003e A: Yes. The UMS4's bays and spring-loaded contacts are sized to accommodate 21700 cells like the 50E without any adapter.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"103:1-104:173;6030-6253\"\u003e\u003cstrong\u003eQ: How do I know if a 50E battery is degraded?\u003c\/strong\u003e A: The UMS4's LCD display shows battery health as \"Good\" or \"Poor\" along with internal resistance readings, making it easy to spot cells that have aged or lost performance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"106:1-107:96;6255-6413\"\u003e\u003cstrong\u003eQ: Can I power the UMS4 with a power bank while traveling?\u003c\/strong\u003e A: Yes. The UMS4 has a USB-C input and works with wall adapters, power banks, and solar panels.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"109:1-110:105;6415-6545\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 4 Samsung INR21700-50E batteries, 1 NITECORE UMS4 charger, a USB-C charging cable, and a user manual.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454224892150,"sku":"OAS1780","price":100.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ums4-samsung-50e-flat-top-4pack-rv-kit-main_98b03a66-198d-403b-a3d2-0b7534a87ee0.webp?v=1786968725"},{"product_id":"samsung-inr21700-50e-5000mah-10a-21700-battery-6-pack-with-nitecore-ums4-ui1-chargers-high-capacity-power-system-for-rv-living-overland-expeditions-off-grid-communication-bases","title":"Samsung INR21700-50E 5000mAh 10A 21700 Battery 6-Pack with Nitecore UMS4 \u0026 Ui1 Chargers – High-Capacity Power System for RV Living, Overland Expeditions \u0026 Off-Grid Communication Bases","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;179-197\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:717;199-915\"\u003eThe Samsung 50E is a high-energy 21700 cell built for runtime, not extreme current — a genuine 5000mAh capacity in a moderate-drain package that's a common choice for e-bikes, power tools, and long-runtime battery packs. Six of these cells need a charging setup that can keep up — at home and on the go. This bundle pairs 6 genuine Samsung INR21700-50E batteries with the NITECORE UMS4 (a 4-bay smart LCD charger for fast, monitored charging at your desk) and the NITECORE UI1 (an ultra-compact single-slot charger for travel or topping off a spare cell). Together, all 6 batteries can be charged at once — 4 in the UMS4, and the 5th and 6th staggered through the UI1 — with full visibility into every cell's health.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:39;922-960\"\u003eSamsung INR21700-50E Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-29:115;962-1648\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSamsung INR21700-50E (Flat Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e5000mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMinimum\/Rated Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4900mAh (standard) \/ 4753mAh (rated, 1C discharge)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e9.8A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eStandard Charge Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.45A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMaximum Charge Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.9A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.20V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDischarge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eLi-ion, energy-focused\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e21700 (approx. Φ20.25mm × 70.8mm, max weight 69g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eProtection Circuit\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNone (unprotected cell)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eE-bikes, power tools, drones, energy storage systems, robotics, professional battery pack builds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"31:1-31:293;1650-1942\"\u003e\u003cem\u003eNote: Samsung's own product positioning specifies the 50E for ESS, power tools, drones, medical devices, robots, and EV applications — and explicitly notes it is not intended for e-cigarettes, flashlights, RC cars, or electric skateboards. It's an energy\/runtime cell, not a high-drain one.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"33:1-33:182;1944-2125\"\u003e\u003cem\u003eThis is an unprotected cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"37:1-37:46;2132-2177\"\u003eThe Chargers: NITECORE UMS4 + NITECORE UI1\u003c\/h2\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"39:1-39:44;2179-2222\"\u003eNITECORE UMS4 — 4-Bay Smart LCD Charger\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"40:1-46:73;2223-3108\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"40:1-40:179;2223-2401\"\u003e\n\u003cstrong\u003eUSB-C input with QC support\u003c\/strong\u003e: up to 4,000mA total output, up to 3,000mA on a single bay with a QC adapter — the closest match here to the 50E's 2.45A standard charge current\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"41:1-41:76;2402-2477\"\u003e\n\u003cstrong\u003eIndependent 4-bay control\u003c\/strong\u003e: charge and monitor each battery separately\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"42:1-42:147;2478-2624\"\u003e\n\u003cstrong\u003eReal-time LCD display\u003c\/strong\u003e: shows battery health (Good\/Poor), internal resistance, charging current, voltage, charged capacity, and charging time\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"43:1-43:116;2625-2740\"\u003e\n\u003cstrong\u003e3 automatic charging modes\u003c\/strong\u003e: CC, CV, and -dV\/dt, selected automatically based on battery type and charge level\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"44:1-44:103;2741-2843\"\u003e\n\u003cstrong\u003eManual adjustment\u003c\/strong\u003e: set charging voltage and current (300mA–3000mA) for specialized battery types\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"45:1-45:192;2844-3035\"\u003e\n\u003cstrong\u003eSafety features\u003c\/strong\u003e: automatic internal resistance detection, reverse-polarity and short-circuit protection, overtime charging protection, and over-discharged battery activation\/restoration\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"46:1-46:73;3036-3108\"\u003e\n\u003cstrong\u003eFire-retardant PC\/ABS housing\u003c\/strong\u003e with built-in temperature regulation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"48:1-48:47;3110-3156\"\u003eNITECORE UI1 — Compact Single-Slot Charger\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"49:1-53:136;3157-3626\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"49:1-49:126;3157-3282\"\u003e\n\u003cstrong\u003eType-C input\u003c\/strong\u003e: automatically adapts to the optimal charging mode, works with power banks, solar panels, and USB adapters\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"50:1-50:62;3283-3344\"\u003e\n\u003cstrong\u003eUp to 1000mA output\u003c\/strong\u003e with automatic CC\/CV mode selection\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"51:1-51:83;3345-3427\"\u003e\n\u003cstrong\u003eTrickle charging\u003c\/strong\u003e protects over-discharged cells and extends battery lifespan\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"52:1-52:63;3428-3490\"\u003e\n\u003cstrong\u003eOver-discharge activation\u003c\/strong\u003e for protected Li-ion batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"53:1-53:136;3491-3626\"\u003e\n\u003cstrong\u003eUltra-lightweight\u003c\/strong\u003e: just 40.5g — ideal for travel, a backup charge, or topping off the 6th cell while the UMS4 handles the other 4\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"57:1-57:37;3633-3669\"\u003eSupported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"59:1-62:56;3671-4117\"\u003e\u003cstrong\u003eNITECORE UMS4\u003c\/strong\u003e — compatible with 3.6V\/3.7V Li-ion, 3.8V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH\/Ni-Cd batteries, including the Samsung 50E (21700) in this bundle: IMR\/Li-ion\/LiFePO4: 10440, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 Ni-MH\/Ni-Cd: AA, AAA, AAAA, C, D Output: up to 3,000mA per bay (QC mode) \/ 4,000mA total\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"64:1-66:55;4119-4499\"\u003e\u003cstrong\u003eNITECORE UI1\u003c\/strong\u003e — compatible with 3.6V\/3.7V Li-ion\/IMR batteries, including the Samsung 50E (21700): 10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650 Output voltage: 4.2V±1% · Output current: up to 1000mA\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"70:1-70:23;4506-4528\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"72:1-72:524;4530-5053\"\u003eThe UMS4's bays and spring-loaded contacts are sized to accommodate 21700 cells like the 50E without any adapter, and the UI1's slot fits the same length range. Since the 50E has a relatively large 5000mAh capacity, charging speed does matter here: the UMS4 (up to 3,000mA on a single occupied bay) will get closer to the 50E's 2.45A rated charge current than the UI1 (up to 1,000mA), so we'd suggest running your most time-sensitive cells through the UMS4 and using the UI1 for the batteries you're least in a hurry about.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"76:1-76:19;5060-5078\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"78:1-82:19;5080-5234\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"78:1-78:35;5080-5114\"\u003eSamsung INR21700-50E Battery × 6\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"79:1-79:34;5115-5148\"\u003eNITECORE UMS4 4-Bay Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"80:1-80:39;5149-5187\"\u003eNITECORE UI1 Single-Slot Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"81:1-81:28;5188-5215\"\u003eUSB-C Charging Cables × 2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"82:1-82:19;5216-5234\"\u003eUser Manuals × 2\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"86:1-86:15;5241-5255\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"88:1-92:50;5257-5780\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"88:1-88:105;5257-5361\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"89:1-89:63;5362-5424\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"90:1-90:82;5425-5506\"\u003eCharge only with genuine, compatible chargers such as the NITECORE UMS4 and UI1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"91:1-91:224;5507-5730\"\u003eThe 50E is an unprotected cell intended for compatible, purpose-built devices such as e-bikes, power tools, and engineered battery packs — it is not intended for e-cigarettes, flashlights, RC cars, or electric skateboards\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"92:1-92:50;5731-5780\"\u003eNever discharge below 2.5V or charge above 4.2V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"96:1-96:7;5787-5793\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"98:1-99:207;5795-6055\"\u003e\u003cstrong\u003eQ: Can I charge all 6 batteries at the same time?\u003c\/strong\u003e A: Yes. The UMS4 charges 4 batteries independently and simultaneously, while the UI1 can charge a 5th battery alongside it — or you can stagger the 5th and 6th through the UI1 if only one is used at a time.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"101:1-102:253;6057-6374\"\u003e\u003cstrong\u003eQ: Is the Samsung 50E suitable for  flashlights?\u003c\/strong\u003e A: No. Samsung's own product positioning explicitly states this cell is not intended for flashlights, RC cars, or electric skateboards. It's built for e-bikes, power tools, drones, energy storage, and similar runtime-focused applications.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"104:1-105:101;6376-6526\"\u003e\u003cstrong\u003eQ: Will 21700 batteries fit in both chargers?\u003c\/strong\u003e A: Yes. Both the UMS4 and UI1 are sized to accommodate 21700 cells like the 50E without any adapter.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"107:1-108:402;6528-6999\"\u003e\u003cstrong\u003eQ: What's the difference between the UMS4 and UI1 in this bundle?\u003c\/strong\u003e A: The UMS4 is a 4-bay charger with an LCD screen showing detailed real-time data (battery health, internal resistance, voltage, capacity) and faster QC charging up to 3,000mA on a single bay. The UI1 is a single-slot, ultra-compact charger (40.5g) best suited for travel or a slower backup charge — with a 5000mAh cell like the 50E, it will take noticeably longer to fill on the UI1 than on the UMS4.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"110:1-111:173;7001-7221\"\u003e\u003cstrong\u003eQ: How do I check if a battery is degraded?\u003c\/strong\u003e A: The UMS4's LCD display shows battery health as \"Good\" or \"Poor\" along with internal resistance readings, making it easy to spot cells that have aged or lost performance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"113:1-114:147;7223-7395\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 6 Samsung INR21700-50E batteries, 1 NITECORE UMS4 charger, 1 NITECORE UI1 charger, 2 USB-C charging cables, and user manuals for both chargers.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454224924918,"sku":"OAS1781","price":125.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ums4-ui1-samsung-50e-flat-top-6pack-overland-kit-main_9182cf74-7dda-46cc-b15a-5c7f7baa9690.webp?v=1786968727"},{"product_id":"samsung-inr21700-50s-5000mah-20a-21700-battery-4-pack-with-nitecore-ums4-smart-charger-reliable-high-power-kit-for-tactical-gear-heavy-duty-tools-high-torque-e-mobility","title":"Samsung INR21700-50S 5000mAh 20A 21700 Battery 4-Pack with Nitecore UMS4 Smart Charger – Reliable High-Power Kit for Tactical Gear, Heavy-Duty Tools \u0026 High-Torque E-Mobility","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;183-201\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:673;203-875\"\u003eThe Samsung 50S steps up from the 50E with the same 5000mAh capacity but a significantly higher discharge ceiling — 20A continuous without a temperature cutoff, or up to 35A with an 80°C thermal cutoff — making it a stronger choice for e-bikes, power tools, and drones that need both energy and real current delivery. A set this capable deserves a charger that can handle every cell at once while keeping close watch on their health. This bundle pairs 4 genuine Samsung INR21700-50S batteries with the NITECORE UMS4, a QC-enabled 4-slot charger with a detailed LCD display, independent bay control, and multiple layers of protection — ready to use straight out of the box.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:39;882-920\"\u003eSamsung INR21700-50S Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-29:120;922-1614\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSamsung INR21700-50S (Flat Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e5000mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMinimum Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4900mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e20A (no temp cutoff) \/ 35A (80°C temp cutoff)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eStandard Charge Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.5A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eRapid Charge Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e6A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.20V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDischarge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eLi-ion, high-capacity\/high-discharge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e21700 (approx. Φ21.25mm × 70.6mm, max weight 72g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eProtection Circuit\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNone (unprotected cell)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eEVs, e-bikes, drones, power tools, e-mobility, and other high-capacity high-drain battery pack builds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"31:1-31:226;1616-1841\"\u003e\u003cem\u003eNote: Samsung's own product positioning lists the 50S for EV, e-bike, drone, power tool, and e-mobility applications, and explicitly states it is not intended for e-cigarettes, flashlights, RC cars, or electric skateboards.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"33:1-33:182;1843-2024\"\u003e\u003cem\u003eThis is an unprotected cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"37:1-37:30;2031-2060\"\u003eThe Charger: NITECORE UMS4\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"39:1-47:95;2062-3235\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"39:1-39:178;2062-2239\"\u003e\n\u003cstrong\u003eUSB-C input with QC support\u003c\/strong\u003e: up to 4,000mA total output; up to 3,000mA on a single bay with a QC adapter — the closest match here to the 50S's 2.5A standard charge current\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"40:1-40:109;2240-2348\"\u003e\n\u003cstrong\u003eQC Mode output\u003c\/strong\u003e: 3,000mA×1 \/ 2,000mA×2 \/ 1,000mA×4 — \u003cstrong\u003eStandard Mode\u003c\/strong\u003e: 2,000mA×1 \/ 1,000mA×2 \/ 500mA×4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"41:1-41:121;2349-2469\"\u003e\n\u003cstrong\u003eIndependent 4-bay control\u003c\/strong\u003e: charge and monitor up to 4 batteries separately, with each bay unaffected by the others\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"42:1-42:202;2470-2671\"\u003e\n\u003cstrong\u003eDetailed real-time LCD display\u003c\/strong\u003e: shows battery health (Good\/Poor), internal resistance, charging current, voltage, battery type, charged capacity, charging time, cut-off voltage, and charging mode\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"43:1-43:116;2672-2787\"\u003e\n\u003cstrong\u003e3 automatic charging modes\u003c\/strong\u003e: CC, CV, and -dV\/dt, selected automatically based on battery type and charge level\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"44:1-44:88;2788-2875\"\u003e\n\u003cstrong\u003eManual adjustment\u003c\/strong\u003e: set charging voltage and current for specialized battery types\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"45:1-45:192;2876-3067\"\u003e\n\u003cstrong\u003eSafety features\u003c\/strong\u003e: automatic internal resistance detection, reverse-polarity and short-circuit protection, overtime charging protection, and over-discharged battery activation\/restoration\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"46:1-46:73;3068-3140\"\u003e\n\u003cstrong\u003eFire-retardant PC\/ABS housing\u003c\/strong\u003e with built-in temperature regulation\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"47:1-47:95;3141-3235\"\u003e\n\u003cstrong\u003eUniversal power input\u003c\/strong\u003e: works with wall adapters, power banks, and solar panels via USB-C\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"51:1-51:53;3242-3294\"\u003eNITECORE UMS4 – Supported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"53:1-53:147;3296-3442\"\u003e\u003cstrong\u003eCompatible with 3.6V\/3.7V Li-ion, 3.8V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH\/Ni-Cd batteries\u003c\/strong\u003e, including the Samsung 50S (21700) in this bundle:\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"55:1-56:33;3444-3672\"\u003eIMR\/Li-ion\/LiFePO4: 10440, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 Ni-MH\/Ni-Cd: AA, AAA, AAAA, C, D\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"58:1-58:68;3674-3741\"\u003e\u003cstrong\u003eOutput current:\u003c\/strong\u003e up to 3,000mA per bay (QC mode) \/ 4,000mA total\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"62:1-62:23;3748-3770\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"64:1-64:374;3772-4145\"\u003eThe UMS4 uses spring-loaded contacts and its bays are sized to comfortably fit 21700 cells like the 50S. Unlike a basic dual-slot travel charger, the UMS4's per-bay output (up to 3,000mA with a QC adapter on a single bay) lines up much more closely with the 50S's 2.5A standard charge current, making full charges considerably faster than a low-current charger would allow.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"66:1-66:221;4147-4367\"\u003e\u003cem\u003eNote: With all 4 bays occupied, each will charge more gently at up to 1,000mA (QC mode) or 500mA (standard mode) — slower than the 50S's rapid-charge rating, but a reasonable, safe charging pace for four cells at once.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"70:1-70:19;4374-4392\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"72:1-75:18;4394-4507\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"72:1-72:35;4394-4428\"\u003eSamsung INR21700-50S Battery × 4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"73:1-73:34;4429-4462\"\u003eNITECORE UMS4 4-Bay Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"74:1-74:27;4463-4489\"\u003eUSB-C Charging Cable × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"75:1-75:18;4490-4507\"\u003eUser Manual × 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"79:1-79:15;4514-4528\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"81:1-85:50;4530-5033\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"81:1-81:105;4530-4634\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"82:1-82:63;4635-4697\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"83:1-83:75;4698-4772\"\u003eCharge only with a genuine, compatible charger such as the NITECORE UMS4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"84:1-84:211;4773-4983\"\u003eThe 50S is an unprotected cell intended for compatible, purpose-built devices such as EVs, e-bikes, drones, and power tools — it is not intended for e-cigarettes, flashlights, RC cars, or electric skateboards\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"85:1-85:50;4984-5033\"\u003eNever discharge below 2.5V or charge above 4.2V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"89:1-89:7;5040-5046\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"91:1-92:279;5048-5392\"\u003e\u003cstrong\u003eQ: Can the NITECORE UMS4 charge Samsung 50S batteries safely?\u003c\/strong\u003e A: Yes. The UMS4 automatically detects Li-ion chemistry and applies the correct charging voltage (4.2V) and current for 50S cells, with real-time monitoring on its LCD display, and its higher per-bay output charges these cells noticeably faster than a basic low-current charger.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"94:1-95:229;5394-5687\"\u003e\u003cstrong\u003eQ: Is the Samsung 50S suitable for  flashlights?\u003c\/strong\u003e A: No. Samsung's own product positioning explicitly states this cell is not intended for  flashlights, RC cars, or electric skateboards. It's built for EVs, e-bikes, drones, power tools, and e-mobility applications.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"97:1-98:259;5689-5991\"\u003e\u003cstrong\u003eQ: How does the 50S compare to the 50E?\u003c\/strong\u003e A: Both share the same 5000mAh capacity, but the 50S has a meaningfully higher discharge ceiling — 20A continuous (35A with thermal cutoff) versus the 50E's 9.8A — making the 50S the better pick for applications that need more current alongside the capacity.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"100:1-101:188;5993-6234\"\u003e\u003cstrong\u003eQ: Can I charge all 4 batteries at the same time?\u003c\/strong\u003e A: Yes. The UMS4 has 4 independent bays and can charge all 4 cells simultaneously — up to 1,000mA per bay in QC mode, or 500mA per bay in standard mode, when all 4 slots are used at once.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"103:1-104:122;6236-6411\"\u003e\u003cstrong\u003eQ: Will 21700 batteries fit properly in the UMS4?\u003c\/strong\u003e A: Yes. The UMS4's bays and spring-loaded contacts are sized to accommodate 21700 cells like the 50S without any adapter.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"106:1-107:173;6413-6636\"\u003e\u003cstrong\u003eQ: How do I know if a 50S battery is degraded?\u003c\/strong\u003e A: The UMS4's LCD display shows battery health as \"Good\" or \"Poor\" along with internal resistance readings, making it easy to spot cells that have aged or lost performance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"109:1-110:105;6638-6768\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 4 Samsung INR21700-50S batteries, 1 NITECORE UMS4 charger, a USB-C charging cable, and a user manual.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454225055990,"sku":"OAS1784","price":103.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ums4-samsung-50s-flat-top-4pack-tactical-kit-main_01fdcf0f-9194-4380-a391-49cee6514e90.webp?v=1786968737"},{"product_id":"samsung-inr21700-50s-5000mah-20a-21700-battery-6-pack-with-nitecore-ums4-ui1-chargers-high-output-power-system-for-construction-sites-drone-production-studios-agricultural-field-operati","title":"Samsung INR21700-50S 5000mAh 20A 21700 Battery 6-Pack with Nitecore UMS4 \u0026 Ui1 Chargers – High-Output Power System for Construction Sites, Drone Production Studios \u0026 Agricultural Field Operations","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;195-213\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:814;215-1028\"\u003eThe Samsung 50S steps up from the 50E with the same 5000mAh capacity but a significantly higher discharge ceiling — 20A continuous without a temperature cutoff, or up to 35A with an 80°C thermal cutoff — making it a stronger choice for e-bikes, power tools, and drones that need both energy and real current delivery. Six of these cells need a charging setup that can keep up — at home and on the go. This bundle pairs 6 genuine Samsung INR21700-50S batteries with the NITECORE UMS4 (a 4-bay smart LCD charger for fast, monitored charging at your desk) and the NITECORE UI1 (an ultra-compact single-slot charger for travel or topping off a spare cell). Together, all 6 batteries can be charged at once — 4 in the UMS4, and the 5th and 6th staggered through the UI1 — with full visibility into every cell's health.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:39;1035-1073\"\u003eSamsung INR21700-50S Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-29:120;1075-1767\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSamsung INR21700-50S (Flat Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e5000mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMinimum Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4900mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e20A (no temp cutoff) \/ 35A (80°C temp cutoff)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eStandard Charge Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.5A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eRapid Charge Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e6A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.20V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDischarge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eLi-ion, high-capacity\/high-discharge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e21700 (approx. Φ21.25mm × 70.6mm, max weight 72g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eProtection Circuit\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNone (unprotected cell)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eEVs, e-bikes, drones, power tools, e-mobility, and other high-capacity high-drain battery pack builds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"31:1-31:226;1769-1994\"\u003e\u003cem\u003eNote: Samsung's own product positioning lists the 50S for EV, e-bike, drone, power tool, and e-mobility applications, and explicitly states it is not intended for e-cigarettes, flashlights, RC cars, or electric skateboards.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"33:1-33:182;1996-2177\"\u003e\u003cem\u003eThis is an unprotected cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"37:1-37:46;2184-2229\"\u003eThe Chargers: NITECORE UMS4 + NITECORE UI1\u003c\/h2\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"39:1-39:44;2231-2274\"\u003eNITECORE UMS4 — 4-Bay Smart LCD Charger\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"40:1-46:73;2275-3159\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"40:1-40:178;2275-2452\"\u003e\n\u003cstrong\u003eUSB-C input with QC support\u003c\/strong\u003e: up to 4,000mA total output, up to 3,000mA on a single bay with a QC adapter — the closest match here to the 50S's 2.5A standard charge current\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"41:1-41:76;2453-2528\"\u003e\n\u003cstrong\u003eIndependent 4-bay control\u003c\/strong\u003e: charge and monitor each battery separately\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"42:1-42:147;2529-2675\"\u003e\n\u003cstrong\u003eReal-time LCD display\u003c\/strong\u003e: shows battery health (Good\/Poor), internal resistance, charging current, voltage, charged capacity, and charging time\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"43:1-43:116;2676-2791\"\u003e\n\u003cstrong\u003e3 automatic charging modes\u003c\/strong\u003e: CC, CV, and -dV\/dt, selected automatically based on battery type and charge level\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"44:1-44:103;2792-2894\"\u003e\n\u003cstrong\u003eManual adjustment\u003c\/strong\u003e: set charging voltage and current (300mA–3000mA) for specialized battery types\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"45:1-45:192;2895-3086\"\u003e\n\u003cstrong\u003eSafety features\u003c\/strong\u003e: automatic internal resistance detection, reverse-polarity and short-circuit protection, overtime charging protection, and over-discharged battery activation\/restoration\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"46:1-46:73;3087-3159\"\u003e\n\u003cstrong\u003eFire-retardant PC\/ABS housing\u003c\/strong\u003e with built-in temperature regulation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"48:1-48:47;3161-3207\"\u003eNITECORE UI1 — Compact Single-Slot Charger\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"49:1-53:136;3208-3677\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"49:1-49:126;3208-3333\"\u003e\n\u003cstrong\u003eType-C input\u003c\/strong\u003e: automatically adapts to the optimal charging mode, works with power banks, solar panels, and USB adapters\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"50:1-50:62;3334-3395\"\u003e\n\u003cstrong\u003eUp to 1000mA output\u003c\/strong\u003e with automatic CC\/CV mode selection\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"51:1-51:83;3396-3478\"\u003e\n\u003cstrong\u003eTrickle charging\u003c\/strong\u003e protects over-discharged cells and extends battery lifespan\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"52:1-52:63;3479-3541\"\u003e\n\u003cstrong\u003eOver-discharge activation\u003c\/strong\u003e for protected Li-ion batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"53:1-53:136;3542-3677\"\u003e\n\u003cstrong\u003eUltra-lightweight\u003c\/strong\u003e: just 40.5g — ideal for travel, a backup charge, or topping off the 6th cell while the UMS4 handles the other 4\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"57:1-57:37;3684-3720\"\u003eSupported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"59:1-62:56;3722-4168\"\u003e\u003cstrong\u003eNITECORE UMS4\u003c\/strong\u003e — compatible with 3.6V\/3.7V Li-ion, 3.8V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH\/Ni-Cd batteries, including the Samsung 50S (21700) in this bundle: IMR\/Li-ion\/LiFePO4: 10440, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 Ni-MH\/Ni-Cd: AA, AAA, AAAA, C, D Output: up to 3,000mA per bay (QC mode) \/ 4,000mA total\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"64:1-66:55;4170-4550\"\u003e\u003cstrong\u003eNITECORE UI1\u003c\/strong\u003e — compatible with 3.6V\/3.7V Li-ion\/IMR batteries, including the Samsung 50S (21700): 10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650 Output voltage: 4.2V±1% · Output current: up to 1000mA\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"70:1-70:23;4557-4579\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"72:1-72:523;4581-5103\"\u003eThe UMS4's bays and spring-loaded contacts are sized to accommodate 21700 cells like the 50S without any adapter, and the UI1's slot fits the same length range. Since the 50S has a relatively large 5000mAh capacity, charging speed does matter here: the UMS4 (up to 3,000mA on a single occupied bay) will get closer to the 50S's 2.5A rated charge current than the UI1 (up to 1,000mA), so we'd suggest running your most time-sensitive cells through the UMS4 and using the UI1 for the batteries you're least in a hurry about.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"76:1-76:19;5110-5128\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"78:1-82:19;5130-5284\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"78:1-78:35;5130-5164\"\u003eSamsung INR21700-50S Battery × 6\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"79:1-79:34;5165-5198\"\u003eNITECORE UMS4 4-Bay Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"80:1-80:39;5199-5237\"\u003eNITECORE UI1 Single-Slot Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"81:1-81:28;5238-5265\"\u003eUSB-C Charging Cables × 2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"82:1-82:19;5266-5284\"\u003eUser Manuals × 2\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"86:1-86:15;5291-5305\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"88:1-92:50;5307-5817\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"88:1-88:105;5307-5411\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"89:1-89:63;5412-5474\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"90:1-90:82;5475-5556\"\u003eCharge only with genuine, compatible chargers such as the NITECORE UMS4 and UI1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"91:1-91:211;5557-5767\"\u003eThe 50S is an unprotected cell intended for compatible, purpose-built devices such as EVs, e-bikes, drones, and power tools — it is not intended for e-cigarettes, flashlights, RC cars, or electric skateboards\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"92:1-92:50;5768-5817\"\u003eNever discharge below 2.5V or charge above 4.2V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"96:1-96:7;5824-5830\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"98:1-99:207;5832-6092\"\u003e\u003cstrong\u003eQ: Can I charge all 6 batteries at the same time?\u003c\/strong\u003e A: Yes. The UMS4 charges 4 batteries independently and simultaneously, while the UI1 can charge a 5th battery alongside it — or you can stagger the 5th and 6th through the UI1 if only one is used at a time.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"101:1-102:229;6094-6387\"\u003e\u003cstrong\u003eQ: Is the Samsung 50S suitable for flashlights?\u003c\/strong\u003e A: No. Samsung's own product positioning explicitly states this cell is not intended for lashlights, RC cars, or electric skateboards. It's built for EVs, e-bikes, drones, power tools, and e-mobility applications.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"104:1-105:259;6389-6691\"\u003e\u003cstrong\u003eQ: How does the 50S compare to the 50E?\u003c\/strong\u003e A: Both share the same 5000mAh capacity, but the 50S has a meaningfully higher discharge ceiling — 20A continuous (35A with thermal cutoff) versus the 50E's 9.8A — making the 50S the better pick for applications that need more current alongside the capacity.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"107:1-108:101;6693-6843\"\u003e\u003cstrong\u003eQ: Will 21700 batteries fit in both chargers?\u003c\/strong\u003e A: Yes. Both the UMS4 and UI1 are sized to accommodate 21700 cells like the 50S without any adapter.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"110:1-111:402;6845-7316\"\u003e\u003cstrong\u003eQ: What's the difference between the UMS4 and UI1 in this bundle?\u003c\/strong\u003e A: The UMS4 is a 4-bay charger with an LCD screen showing detailed real-time data (battery health, internal resistance, voltage, capacity) and faster QC charging up to 3,000mA on a single bay. The UI1 is a single-slot, ultra-compact charger (40.5g) best suited for travel or a slower backup charge — with a 5000mAh cell like the 50S, it will take noticeably longer to fill on the UI1 than on the UMS4.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"113:1-114:173;7318-7538\"\u003e\u003cstrong\u003eQ: How do I check if a battery is degraded?\u003c\/strong\u003e A: The UMS4's LCD display shows battery health as \"Good\" or \"Poor\" along with internal resistance readings, making it easy to spot cells that have aged or lost performance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"116:1-117:147;7540-7712\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 6 Samsung INR21700-50S batteries, 1 NITECORE UMS4 charger, 1 NITECORE UI1 charger, 2 USB-C charging cables, and user manuals for both chargers.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454225088758,"sku":"OAS1785","price":133.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ums4-ui1-samsung-50s-flat-top-6pack-construction-kit-main_07322104-76b8-4db1-85ea-23498b05ceb7.webp?v=1786968739"},{"product_id":"samsung-inr21700-50g-5000mah-high-capacity-21700-battery-4-piece-set-with-nitecore-ums4-smart-charger","title":"Samsung INR21700-50G 5000mAh High-Capacity 21700 Battery 4-Piece Set with Nitecore UMS4 Smart Charger","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;167-185\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:609;187-795\"\u003eThe Samsung 50G is a high-energy 21700 cell in the same general class as the 50E — a genuine 5000mAh capacity with a 9.8A continuous discharge rating (up to 14.7A in short pulses), built for runtime-focused applications rather than extreme current draw. A set this capable deserves a charger that can handle every cell at once while keeping close watch on their health. This bundle pairs 4 genuine Samsung INR21700-50G batteries with the NITECORE UMS4, a QC-enabled 4-slot charger with a detailed LCD display, independent bay control, and multiple layers of protection — ready to use straight out of the box.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:39;802-840\"\u003eSamsung INR21700-50G Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-28:107;842-1534\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSamsung INR21700-50G (Flat Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eStandard Discharge Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e5000mAh (4900mAh minimum)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.63V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e9.8A (14.7A pulse, not for continuous use)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eStandard Charge Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.45A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMaximum Charge Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.9A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.20V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDischarge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eLi-ion, energy-focused\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e21700 (approx. Φ21.1mm × 70.15mm, max weight 69.5g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top only (slightly recessed top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eProtection Circuit\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNone (unprotected cell)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eE-bikes, power tools, energy storage systems, robotics, professional battery pack builds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"30:1-30:182;1536-1717\"\u003e\u003cem\u003eNote: This cell is an energy\/runtime-focused 21700, similar in profile to the Samsung 50E — built for moderate, sustained current draw rather than extreme high-drain applications.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"32:1-32:182;1719-1900\"\u003e\u003cem\u003eThis is an unprotected cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"36:1-36:30;1907-1936\"\u003eThe Charger: NITECORE UMS4\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"38:1-46:95;1938-3112\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"38:1-38:179;1938-2116\"\u003e\n\u003cstrong\u003eUSB-C input with QC support\u003c\/strong\u003e: up to 4,000mA total output; up to 3,000mA on a single bay with a QC adapter — the closest match here to the 50G's 2.45A standard charge current\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"39:1-39:109;2117-2225\"\u003e\n\u003cstrong\u003eQC Mode output\u003c\/strong\u003e: 3,000mA×1 \/ 2,000mA×2 \/ 1,000mA×4 — \u003cstrong\u003eStandard Mode\u003c\/strong\u003e: 2,000mA×1 \/ 1,000mA×2 \/ 500mA×4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"40:1-40:121;2226-2346\"\u003e\n\u003cstrong\u003eIndependent 4-bay control\u003c\/strong\u003e: charge and monitor up to 4 batteries separately, with each bay unaffected by the others\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"41:1-41:202;2347-2548\"\u003e\n\u003cstrong\u003eDetailed real-time LCD display\u003c\/strong\u003e: shows battery health (Good\/Poor), internal resistance, charging current, voltage, battery type, charged capacity, charging time, cut-off voltage, and charging mode\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"42:1-42:116;2549-2664\"\u003e\n\u003cstrong\u003e3 automatic charging modes\u003c\/strong\u003e: CC, CV, and -dV\/dt, selected automatically based on battery type and charge level\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"43:1-43:88;2665-2752\"\u003e\n\u003cstrong\u003eManual adjustment\u003c\/strong\u003e: set charging voltage and current for specialized battery types\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"44:1-44:192;2753-2944\"\u003e\n\u003cstrong\u003eSafety features\u003c\/strong\u003e: automatic internal resistance detection, reverse-polarity and short-circuit protection, overtime charging protection, and over-discharged battery activation\/restoration\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"45:1-45:73;2945-3017\"\u003e\n\u003cstrong\u003eFire-retardant PC\/ABS housing\u003c\/strong\u003e with built-in temperature regulation\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"46:1-46:95;3018-3112\"\u003e\n\u003cstrong\u003eUniversal power input\u003c\/strong\u003e: works with wall adapters, power banks, and solar panels via USB-C\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"50:1-50:53;3119-3171\"\u003eNITECORE UMS4 – Supported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"52:1-52:147;3173-3319\"\u003e\u003cstrong\u003eCompatible with 3.6V\/3.7V Li-ion, 3.8V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH\/Ni-Cd batteries\u003c\/strong\u003e, including the Samsung 50G (21700) in this bundle:\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"54:1-55:33;3321-3549\"\u003eIMR\/Li-ion\/LiFePO4: 10440, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 Ni-MH\/Ni-Cd: AA, AAA, AAAA, C, D\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"57:1-57:68;3551-3618\"\u003e\u003cstrong\u003eOutput current:\u003c\/strong\u003e up to 3,000mA per bay (QC mode) \/ 4,000mA total\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"61:1-61:23;3625-3647\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"63:1-63:375;3649-4023\"\u003eThe UMS4 uses spring-loaded contacts and its bays are sized to comfortably fit 21700 cells like the 50G. Unlike a basic dual-slot travel charger, the UMS4's per-bay output (up to 3,000mA with a QC adapter on a single bay) lines up much more closely with the 50G's 2.45A standard charge current, making full charges considerably faster than a low-current charger would allow.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"65:1-65:223;4025-4247\"\u003e\u003cem\u003eNote: With all 4 bays occupied, each will charge more gently at up to 1,000mA (QC mode) or 500mA (standard mode) — still slower than the 50G's max 4.9A rating, but a reasonable, safe charging pace for four cells at once.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"69:1-69:19;4254-4272\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"71:1-74:18;4274-4387\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"71:1-71:35;4274-4308\"\u003eSamsung INR21700-50G Battery × 4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"72:1-72:34;4309-4342\"\u003eNITECORE UMS4 4-Bay Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"73:1-73:27;4343-4369\"\u003eUSB-C Charging Cable × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"74:1-74:18;4370-4387\"\u003eUser Manual × 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"78:1-78:15;4394-4408\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"80:1-84:50;4410-4841\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"80:1-80:105;4410-4514\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"81:1-81:63;4515-4577\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"82:1-82:75;4578-4652\"\u003eCharge only with a genuine, compatible charger such as the NITECORE UMS4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"83:1-83:139;4653-4791\"\u003eThe 50G is an unprotected cell intended for compatible, purpose-built devices such as e-bikes, power tools, and engineered battery packs\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"84:1-84:50;4792-4841\"\u003eNever discharge below 2.5V or charge above 4.2V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"88:1-88:7;4848-4854\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"90:1-91:279;4856-5200\"\u003e\u003cstrong\u003eQ: Can the NITECORE UMS4 charge Samsung 50G batteries safely?\u003c\/strong\u003e A: Yes. The UMS4 automatically detects Li-ion chemistry and applies the correct charging voltage (4.2V) and current for 50G cells, with real-time monitoring on its LCD display, and its higher per-bay output charges these cells noticeably faster than a basic low-current charger.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"93:1-94:278;5202-5523\"\u003e\u003cstrong\u003eQ: How does the 50G compare to the 50E?\u003c\/strong\u003e A: The two are very close in profile — both 5000mAh-class cells with similar continuous discharge ratings (50G: 9.8A continuous\/14.7A pulse; 50E: 9.8A). Independent testing has found the 50E slightly edges out the 50G in raw capacity, while both deliver similar overall energy.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"96:1-97:188;5525-5766\"\u003e\u003cstrong\u003eQ: Can I charge all 4 batteries at the same time?\u003c\/strong\u003e A: Yes. The UMS4 has 4 independent bays and can charge all 4 cells simultaneously — up to 1,000mA per bay in QC mode, or 500mA per bay in standard mode, when all 4 slots are used at once.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"99:1-100:122;5768-5943\"\u003e\u003cstrong\u003eQ: Will 21700 batteries fit properly in the UMS4?\u003c\/strong\u003e A: Yes. The UMS4's bays and spring-loaded contacts are sized to accommodate 21700 cells like the 50G without any adapter.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"102:1-103:173;5945-6168\"\u003e\u003cstrong\u003eQ: How do I know if a 50G battery is degraded?\u003c\/strong\u003e A: The UMS4's LCD display shows battery health as \"Good\" or \"Poor\" along with internal resistance readings, making it easy to spot cells that have aged or lost performance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"105:1-106:96;6170-6328\"\u003e\u003cstrong\u003eQ: Can I power the UMS4 with a power bank while traveling?\u003c\/strong\u003e A: Yes. The UMS4 has a USB-C input and works with wall adapters, power banks, and solar panels.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"108:1-109:105;6330-6460\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 4 Samsung INR21700-50G batteries, 1 NITECORE UMS4 charger, a USB-C charging cable, and a user manual.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454225252598,"sku":"OAS1788","price":95.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ums4-samsung-50g-flat-top-4pack-set-main_fb0ba845-3428-411e-93f1-0f8cd41a5f6c.webp?v=1786968748"},{"product_id":"samsung-inr21700-50g-5000mah-high-capacity-21700-battery-6-piece-bundle-with-nitecore-ums4-ui1-smart-chargers","title":"Samsung INR21700-50G 5000mAh High-Capacity 21700 Battery 6-Piece Bundle with Nitecore UMS4 \u0026 Ui1 Smart Chargers","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;179-197\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:750;199-948\"\u003eThe Samsung 50G is a high-energy 21700 cell in the same general class as the 50E — a genuine 5000mAh capacity with a 9.8A continuous discharge rating (up to 14.7A in short pulses), built for runtime-focused applications rather than extreme current draw. Six of these cells need a charging setup that can keep up — at home and on the go. This bundle pairs 6 genuine Samsung INR21700-50G batteries with the NITECORE UMS4 (a 4-bay smart LCD charger for fast, monitored charging at your desk) and the NITECORE UI1 (an ultra-compact single-slot charger for travel or topping off a spare cell). Together, all 6 batteries can be charged at once — 4 in the UMS4, and the 5th and 6th staggered through the UI1 — with full visibility into every cell's health.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:39;955-993\"\u003eSamsung INR21700-50G Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-28:107;995-1687\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSamsung INR21700-50G (Flat Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eStandard Discharge Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e5000mAh (4900mAh minimum)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.63V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e9.8A (14.7A pulse, not for continuous use)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eStandard Charge Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.45A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMaximum Charge Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.9A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.20V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDischarge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eLi-ion, energy-focused\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e21700 (approx. Φ21.1mm × 70.15mm, max weight 69.5g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top only (slightly recessed top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eProtection Circuit\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNone (unprotected cell)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eE-bikes, power tools, energy storage systems, robotics, professional battery pack builds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"30:1-30:182;1689-1870\"\u003e\u003cem\u003eNote: This cell is an energy\/runtime-focused 21700, similar in profile to the Samsung 50E — built for moderate, sustained current draw rather than extreme high-drain applications.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"32:1-32:182;1872-2053\"\u003e\u003cem\u003eThis is an unprotected cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"36:1-36:46;2060-2105\"\u003eThe Chargers: NITECORE UMS4 + NITECORE UI1\u003c\/h2\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"38:1-38:44;2107-2150\"\u003eNITECORE UMS4 — 4-Bay Smart LCD Charger\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"39:1-45:73;2151-3036\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"39:1-39:179;2151-2329\"\u003e\n\u003cstrong\u003eUSB-C input with QC support\u003c\/strong\u003e: up to 4,000mA total output, up to 3,000mA on a single bay with a QC adapter — the closest match here to the 50G's 2.45A standard charge current\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"40:1-40:76;2330-2405\"\u003e\n\u003cstrong\u003eIndependent 4-bay control\u003c\/strong\u003e: charge and monitor each battery separately\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"41:1-41:147;2406-2552\"\u003e\n\u003cstrong\u003eReal-time LCD display\u003c\/strong\u003e: shows battery health (Good\/Poor), internal resistance, charging current, voltage, charged capacity, and charging time\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"42:1-42:116;2553-2668\"\u003e\n\u003cstrong\u003e3 automatic charging modes\u003c\/strong\u003e: CC, CV, and -dV\/dt, selected automatically based on battery type and charge level\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"43:1-43:103;2669-2771\"\u003e\n\u003cstrong\u003eManual adjustment\u003c\/strong\u003e: set charging voltage and current (300mA–3000mA) for specialized battery types\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"44:1-44:192;2772-2963\"\u003e\n\u003cstrong\u003eSafety features\u003c\/strong\u003e: automatic internal resistance detection, reverse-polarity and short-circuit protection, overtime charging protection, and over-discharged battery activation\/restoration\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"45:1-45:73;2964-3036\"\u003e\n\u003cstrong\u003eFire-retardant PC\/ABS housing\u003c\/strong\u003e with built-in temperature regulation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"47:1-47:47;3038-3084\"\u003eNITECORE UI1 — Compact Single-Slot Charger\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"48:1-52:136;3085-3554\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"48:1-48:126;3085-3210\"\u003e\n\u003cstrong\u003eType-C input\u003c\/strong\u003e: automatically adapts to the optimal charging mode, works with power banks, solar panels, and USB adapters\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"49:1-49:62;3211-3272\"\u003e\n\u003cstrong\u003eUp to 1000mA output\u003c\/strong\u003e with automatic CC\/CV mode selection\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"50:1-50:83;3273-3355\"\u003e\n\u003cstrong\u003eTrickle charging\u003c\/strong\u003e protects over-discharged cells and extends battery lifespan\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"51:1-51:63;3356-3418\"\u003e\n\u003cstrong\u003eOver-discharge activation\u003c\/strong\u003e for protected Li-ion batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"52:1-52:136;3419-3554\"\u003e\n\u003cstrong\u003eUltra-lightweight\u003c\/strong\u003e: just 40.5g — ideal for travel, a backup charge, or topping off the 6th cell while the UMS4 handles the other 4\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"56:1-56:37;3561-3597\"\u003eSupported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"58:1-61:56;3599-4045\"\u003e\u003cstrong\u003eNITECORE UMS4\u003c\/strong\u003e — compatible with 3.6V\/3.7V Li-ion, 3.8V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH\/Ni-Cd batteries, including the Samsung 50G (21700) in this bundle: IMR\/Li-ion\/LiFePO4: 10440, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 1.2V Ni-MH\/Ni-Cd: AA, AAA, AAAA, C, D Output: up to 3,000mA per bay (QC mode) \/ 4,000mA total\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"63:1-65:55;4047-4427\"\u003e\u003cstrong\u003eNITECORE UI1\u003c\/strong\u003e — compatible with 3.6V\/3.7V Li-ion\/IMR batteries, including the Samsung 50G (21700): 10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650 Output voltage: 4.2V±1% · Output current: up to 1000mA\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"69:1-69:23;4434-4456\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"71:1-71:524;4458-4981\"\u003eThe UMS4's bays and spring-loaded contacts are sized to accommodate 21700 cells like the 50G without any adapter, and the UI1's slot fits the same length range. Since the 50G has a relatively large 5000mAh capacity, charging speed does matter here: the UMS4 (up to 3,000mA on a single occupied bay) will get closer to the 50G's 2.45A rated charge current than the UI1 (up to 1,000mA), so we'd suggest running your most time-sensitive cells through the UMS4 and using the UI1 for the batteries you're least in a hurry about.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"75:1-75:19;4988-5006\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"77:1-81:19;5008-5162\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"77:1-77:35;5008-5042\"\u003eSamsung INR21700-50G Battery × 6\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"78:1-78:34;5043-5076\"\u003eNITECORE UMS4 4-Bay Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"79:1-79:39;5077-5115\"\u003eNITECORE UI1 Single-Slot Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"80:1-80:28;5116-5143\"\u003eUSB-C Charging Cables × 2\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"81:1-81:19;5144-5162\"\u003eUser Manuals × 2\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"85:1-85:15;5169-5183\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"87:1-91:50;5185-5623\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"87:1-87:105;5185-5289\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"88:1-88:63;5290-5352\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"89:1-89:82;5353-5434\"\u003eCharge only with genuine, compatible chargers such as the NITECORE UMS4 and UI1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"90:1-90:139;5435-5573\"\u003eThe 50G is an unprotected cell intended for compatible, purpose-built devices such as e-bikes, power tools, and engineered battery packs\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"91:1-91:50;5574-5623\"\u003eNever discharge below 2.5V or charge above 4.2V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"95:1-95:7;5630-5636\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"97:1-98:207;5638-5898\"\u003e\u003cstrong\u003eQ: Can I charge all 6 batteries at the same time?\u003c\/strong\u003e A: Yes. The UMS4 charges 4 batteries independently and simultaneously, while the UI1 can charge a 5th battery alongside it — or you can stagger the 5th and 6th through the UI1 if only one is used at a time.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"100:1-101:278;5900-6221\"\u003e\u003cstrong\u003eQ: How does the 50G compare to the 50E?\u003c\/strong\u003e A: The two are very close in profile — both 5000mAh-class cells with similar continuous discharge ratings (50G: 9.8A continuous\/14.7A pulse; 50E: 9.8A). Independent testing has found the 50E slightly edges out the 50G in raw capacity, while both deliver similar overall energy.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"103:1-104:101;6223-6373\"\u003e\u003cstrong\u003eQ: Will 21700 batteries fit in both chargers?\u003c\/strong\u003e A: Yes. Both the UMS4 and UI1 are sized to accommodate 21700 cells like the 50G without any adapter.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"106:1-107:402;6375-6846\"\u003e\u003cstrong\u003eQ: What's the difference between the UMS4 and UI1 in this bundle?\u003c\/strong\u003e A: The UMS4 is a 4-bay charger with an LCD screen showing detailed real-time data (battery health, internal resistance, voltage, capacity) and faster QC charging up to 3,000mA on a single bay. The UI1 is a single-slot, ultra-compact charger (40.5g) best suited for travel or a slower backup charge — with a 5000mAh cell like the 50G, it will take noticeably longer to fill on the UI1 than on the UMS4.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"109:1-110:173;6848-7068\"\u003e\u003cstrong\u003eQ: How do I check if a battery is degraded?\u003c\/strong\u003e A: The UMS4's LCD display shows battery health as \"Good\" or \"Poor\" along with internal resistance readings, making it easy to spot cells that have aged or lost performance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"112:1-113:147;7070-7242\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 6 Samsung INR21700-50G batteries, 1 NITECORE UMS4 charger, 1 NITECORE UI1 charger, 2 USB-C charging cables, and user manuals for both chargers.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454225318134,"sku":"OAS1789","price":119.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ums4-ui1-samsung-50g-flat-top-6pack-bundle-main_a8a0b7cc-3348-4a53-9f43-dda5233a3aa0.webp?v=1786968752"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/collections\/Nitecore.jpg?v=1786675987","url":"https:\/\/oneandes.com\/collections\/nitecore.oembed","provider":"OneAndes","version":"1.0","type":"link"}