{"product_id":"xtar-vc4sl-21700-5000mah-rechargeable-battery-and-lcd-charger-3a-fast-charging-3-7volt-high-capacity21700-battery-for-strong-flashlight-and-other-electronic-devices","title":"XTAR VC4SL Smart Charger with 21700 4900mAh 10A Battery Bundle | 3A Fast Charging with Capacity Grading \u0026 IR Test for Flashlights and Drones","description":"\u003ch2\u003e\u003cspan class=\"\"\u003eProduct Description\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eThis bundle combines the advanced XTAR VC4SL 4-slot smart battery charger with high-capacity XTAR 21700 4900mAh 10A lithium-ion rechargeable batteries. (Available in 1-Pack or 2-Pack options). The included 21700 battery delivers a massive 4900mAh capacity with a 3.6V rated voltage and supports a robust 10A maximum continuous discharge current, making it an excellent choice for high-drain devices. The VC4SL charger offers not only QC3.0 3A fast charging via Type-C, but also professional testing features such as Capacity Grading to measure true mAh, Internal Resistance testing to detect aging cells, and a Storage mode to automatically maintain batteries at their optimal 3.7V storage voltage. This kit provides a comprehensive, intelligent, and safe power solution for your electronic 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=\"\"\u003eComplete High-Performance Kit: Includes one XTAR VC4SL 4-slot smart charger (with Type-C cable \u0026amp; storage pouch) and one or two XTAR 21700 4900mAh 10A batteries.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eMassive Battery Capacity: The battery provides 4900mAh capacity, a 3.6V nominal voltage, a 4.2V charging cut-off voltage, and supports a 10A maximum continuous discharge current, ensuring long-lasting and stable power.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eFast QC3.0 Charging: The VC4SL features a Type-C input supporting 9V (QC3.0) power, allowing for an ultra-fast 3A single-slot charging current. Currents can be adjusted to 2A for dual slots, and 1A\/0.5A\/0.25A for four-slot charging based on needs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eAdvanced Battery Diagnostics: Equipped with a clear LCD screen, it offers a Capacity Grading mode to reveal the true capacity (mAh) via a charge-discharge-charge cycle, and an accurate Internal Resistance (IR) test to identify aging or damaged batteries.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eIntelligent Storage Mode: The charger's Storage Mode will automatically charge or discharge the battery to the optimal long-term storage voltage (3.7V for Li-ion, 1.2V for Ni-MH), significantly slowing down capacity degradation over time.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eWide Compatibility \u0026amp; Precision Voltage: The VC4SL's spring-loaded slots support a vast array of 3.6V\/3.7V Li-ion batteries (10440 to 32650) and 1.2V Ni-MH\/Ni-CD batteries. It features a highly precise charging cut-off voltage of 4.20V ± 0.05V for Li-ion to ensure safe and full charging without damage.\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\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eCharger (XTAR VC4SL):\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 Power: QC3.0 Type-C (9V\/2A, Max 18W)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eConstant Charging Current: 3Ax1 \/ 2Ax2 \/ 1Ax4 \/ 0.5Ax4 \/ 0.25Ax4\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eCharging Cut-off Voltage: 4.20V ± 0.05V (Li-ion) \/ 1.45V ± 0.1V (Ni-MH)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eCharging Cut-off Current: ≤120mA\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eOptimal Storage Voltage: 3.7V (Li-ion), 1.2V (Ni-MH)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eOperating Temperature: 0°C - 40°C\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eDimensions: L156 x W115 x H35 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: 212g\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 Sizes: 10440, 14500, 14650, 16340, 17335, 17500, 17670, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22650, 25500, 26650, 32650 (Flat Top)\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 Sizes: AAA, AA, A, SC, C\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=\"\"\u003eBattery (XTAR 21700 4900mAh):\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: XTAR\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eModel: 21700 Rechargeable Li-ion Battery\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eNominal Capacity: 4900mAh\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eNominal Voltage: 3.6V\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eCharging Cut-off Voltage: 4.2V\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eMax Continuous Discharge Current: 10A\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eWeight: 71g\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eDimensions: 21.4 ± 0.3mm (Diameter) x 74.8 ± 0.5mm (Height)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cem\u003e\u003cspan class=\"\"\u003eNote: Manual measurement may have an error margin of 0.5mm.\u003c\/span\u003e\u003c\/em\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=\"\"\u003eProvides long-lasting power for high-lumen tactical flashlights and EDC searchlights.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eProfessional battery grading and power management for RC drones and model aircraft.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eReliable energy for portable radios, intercoms, and outdoor communication equipment.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eBackup power supply for emergency kits, power banks, and outdoor camping gear.\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 included in this bundle?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA1: This bundle includes one XTAR VC4SL 4-slot smart charger, one Type-C fast charging cable, one user manual, one travel storage pouch, and either 1 or 2 units of the XTAR 21700 4900mAh 10A batteries based on your selection.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ2: Is the 21700 4900mAh battery compatible with the VC4SL charger?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA2: Yes. The VC4SL features a flexible spring-loaded slot design that is specifically engineered to accommodate protected 21700 batteries (21.4mm x 74.8mm) safely and securely.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ3: What does the 10A discharge current mean for my devices?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA3: The 10A maximum continuous discharge current ensures the battery can safely deliver high power to devices requiring high drain, like powerful flashlights and drone motors, without overheating or voltage sag.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ4: What are the actual voltage parameters of the charging cut-off?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA4: The VC4SL uses a highly precise charging cut-off voltage of 4.20V ± 0.05V for 3.6V\/3.7V lithium-ion batteries and 1.45V ± 0.1V for 1.2V Ni-MH batteries, ensuring full charge without overcharging risks. The Storage mode will maintain a safe voltage of 3.7V for this 21700 battery.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ5: How do I achieve the maximum 3A charging speed?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA5: To reach 3A fast charging, you must use a QC3.0 (9V\/2A) power adapter, insert a battery into a single slot, and do not insert any other batteries into the charger. The charger will automatically detect the input voltage and regulate the optimal current.\u003c\/span\u003e\u003c\/p\u003e","brand":"XTAR","offers":[{"title":"1 Pack 21700 Button Top Battery+LCD Charger","offer_id":51454131142902,"sku":"OAS238","price":52.98,"currency_code":"USD","in_stock":true},{"title":"2 Packs 21700 Button Top Battery+LCD Charger","offer_id":51454131175670,"sku":"OAS239","price":79.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/xtar-vc4sl-21700-5000mah-charger-kit-main-product-1_49f3c7a6-b457-4bf1-849c-bfe662b1ceeb.webp?v=1786965459","url":"https:\/\/oneandes.com\/products\/xtar-vc4sl-21700-5000mah-rechargeable-battery-and-lcd-charger-3a-fast-charging-3-7volt-high-capacity21700-battery-for-strong-flashlight-and-other-electronic-devices","provider":"OneAndes","version":"1.0","type":"link"}