{"title":"Protected 21700 Charger","description":"\u003cdetails\u003e\n  \u003csummary style=\"font-weight: bold; cursor: pointer; color: #00917A; font-size: 18px; margin-bottom: 10px;\"\u003e\n    📖 Click to view full specifications, comparison \u0026amp; safety guide\n  \u003c\/summary\u003e\n  \u003cdiv style=\"margin-top: 10px; line-height: 1.6;\"\u003e\n    \u003ch2\u003eProtected 21700 Charger – Dedicated Chargers for Protected 21700 Cells, Precision \u0026amp; Safe Charging Management\u003c\/h2\u003e\n    \u003cp\u003eWelcome to our \u003cstrong\u003eProtected 21700 Charger\u003c\/strong\u003e collection. The 21700 battery (approx. 21mm diameter × 70mm length) has rapidly become the new standard for high-performance portable power, offering a compelling balance of \u003cstrong\u003ecapacity, discharge capability, and energy density\u003c\/strong\u003e that surpasses the traditional 18650. With nominal voltages of \u003cstrong\u003e3.6V\/3.7V\u003c\/strong\u003e, full charge cut-off at \u003cstrong\u003e4.2V\u003c\/strong\u003e, and typical capacities ranging from \u003cstrong\u003e4000mAh to 5500mAh\u003c\/strong\u003e, the 21700 platform is widely used in \u003cstrong\u003ehigh-lumen flashlights, power banks, e-bikes, power tools, and various portable electronic devices\u003c\/strong\u003e.\u003c\/p\u003e\n    \u003cp\u003eHowever, \u003cstrong\u003eprotected 21700 cells\u003c\/strong\u003e present a unique compatibility challenge: the built-in protection circuit (PCM) and button-top design add extra length, typically extending the battery to \u003cstrong\u003e74mm–76mm\u003c\/strong\u003e. This is significantly longer than the 70mm of standard 21700 cells and exceeds the slider travel of many older chargers designed primarily for 18650 batteries. Therefore, selecting a charger that \u003cstrong\u003eexplicitly supports protected 21700 cells and features extended slider travel (≥76mm)\u003c\/strong\u003e is essential.\u003c\/p\u003e\n    \u003cp\u003eThis collection features high-quality chargers from global professional brands like \u003cstrong\u003eXTAR, Nitecore, ANSMANN, and EBL\u003c\/strong\u003e that are explicitly compatible with protected 21700 batteries—ranging from single-bay portable chargers to 8-bay multi-function chargers—ensuring your protected 21700 batteries are recharged in the \u003cstrong\u003esafest, most efficient, and most precise\u003c\/strong\u003e manner.\u003c\/p\u003e\n\n    \u003ch3\u003eProtected 21700 Battery Key Specifications\u003c\/h3\u003e\n    \u003ctable style=\"border-collapse: collapse; width: 100%; border: 1px solid #e0e0e0; margin-bottom: 20px;\"\u003e\n      \u003cthead\u003e\n        \u003ctr style=\"background-color: #f8f9fa;\"\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eParameter\u003c\/th\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eProtected 21700 (Li-ion)\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eNominal Voltage\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e3.6V – 3.7V\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eFull Charge Voltage\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e4.2V ±0.05V\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eTypical Capacity Range\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e4000mAh – 5500mAh\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eDimensions (Diameter × Length)\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e~21.2mm–21.8mm × 74mm–76mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eRecommended Charge Current\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e0.5A – 2.0A (1A–1.5A recommended)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e~70g – 75g\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eKey Characteristic\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eButton-top design with built-in protection circuit; length 74–76mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n\n    \u003ch3\u003eProtected vs. Unprotected 21700 – What You Need to Know\u003c\/h3\u003e\n    \u003ctable style=\"border-collapse: collapse; width: 100%; border: 1px solid #e0e0e0; margin-bottom: 20px;\"\u003e\n      \u003cthead\u003e\n        \u003ctr style=\"background-color: #f8f9fa;\"\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eFeature\u003c\/th\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eProtected 21700\u003c\/th\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eUnprotected 21700\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eLength\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e74–76mm\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e~70mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eTop Design\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eButton-top\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eFlat-top or button-top\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eBuilt-in Protection\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eOvercharge, over-discharge, short-circuit\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eNone (relies on external device)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eCharger Compatibility\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eRequires extended slider (≥76mm)\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eWorks with most 21700-compatible chargers\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eBest For\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eFlashlights, vapes, devices without built-in protection\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eBattery packs, devices with built-in BMS\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n\n    \u003ch3\u003eCore Advantages of Protected 21700 Chargers\u003c\/h3\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cstrong\u003eExtended Slider Travel – Secure Fit for Longer Cells:\u003c\/strong\u003e Protected 21700 cells measure ~74–76mm in length—4–6mm longer than standard 21700 cells. Chargers in this collection feature \u003cstrong\u003eextended slider travel (≥76mm) and wide charging bays\u003c\/strong\u003e that securely accommodate protected button-top cells, ensuring reliable contact and preventing charging interruptions. Models like the \u003cstrong\u003eXTAR SC2\u003c\/strong\u003e and \u003cstrong\u003eNitecore UI2\u003c\/strong\u003e are explicitly designed to handle protected 21700 cells. The \u003cstrong\u003eNitecore UMS2\u003c\/strong\u003e and \u003cstrong\u003eXTAR VC4SL\u003c\/strong\u003e are also noted for protected 21700 compatibility.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eMulti-Chemistry Auto-Detection:\u003c\/strong\u003e Most chargers in this collection support automatic detection of \u003cstrong\u003e3.6V\/3.7V Li-ion\u003c\/strong\u003e, with select professional models also supporting \u003cstrong\u003eNiMH (1.2V)\u003c\/strong\u003e and \u003cstrong\u003eLiFePO₄ (3.2V)\u003c\/strong\u003e chemistries. The \u003cstrong\u003eNitecore Ci4\u003c\/strong\u003e automatically detects battery chemistry and selects the appropriate voltage and charging mode (CC, CV, or -dV\/dt).\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003ePrecision Adaptive Charging Current:\u003c\/strong\u003e With typical capacities of 4000mAh–5500mAh, 21700 cells charge best at 0.5A–2.0A. These chargers support \u003cstrong\u003eadaptive or manually adjustable currents\u003c\/strong\u003e to prevent damage from excessive current and extend battery lifespan. The \u003cstrong\u003eXTAR FC2\u003c\/strong\u003e supports manual selection of 2A\/1A\/0.5A charging currents, while the \u003cstrong\u003eNitecore Ci4\u003c\/strong\u003e offers up to 3A per slot in fast charge mode.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eCC\/CV Smart Charging Management:\u003c\/strong\u003e Utilizes constant-current\/constant-voltage (CC\/CV) charging profiles controlled by built-in microprocessors. The charger automatically detects battery status and internal resistance to precisely control charging current and cut-off voltage. Typical cut-off accuracy reaches \u003cstrong\u003e4.2V ±0.05V\u003c\/strong\u003e, automatically terminating upon full charge to prevent overcharging. The \u003cstrong\u003eXTAR SC2\u003c\/strong\u003e employs \u003cstrong\u003eTC-CC-CV three-stage charging\u003c\/strong\u003e for safer, more efficient charging.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eIndependent Charging Channels – Mix and Match:\u003c\/strong\u003e Multi-bay chargers feature independently controlled channels, allowing simultaneous charging of different battery sizes and chemistries—mix protected 21700, 18650, 20700, 26650, AA, AAA, and other cell sizes without interference. The \u003cstrong\u003eNitecore i8\u003c\/strong\u003e features 8 independent channels, and the \u003cstrong\u003eXTAR VC8S\u003c\/strong\u003e supports charging 8 protected 21700 cells simultaneously.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003e0V Activation – Rescuing Over-Discharged Batteries:\u003c\/strong\u003e Many chargers feature \u003cstrong\u003e0V activation\u003c\/strong\u003e, which applies a trickle current to revive batteries that have been discharged below 2.5V. This can recover batteries that would otherwise be considered \"dead\". The \u003cstrong\u003eXTAR MC2\u003c\/strong\u003e and \u003cstrong\u003eVC2SL\u003c\/strong\u003e both feature this function.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eMultiple Safety Protections:\u003c\/strong\u003e Built-in protections against \u003cstrong\u003eovercharge, over-discharge, overcurrent, short-circuit, reverse polarity, overheat, and charge timeout\u003c\/strong\u003e ensure comprehensive charging safety. Most products feature \u003cstrong\u003efire-retardant PC materials\u003c\/strong\u003e and are certified to CE, FCC, and RoHS standards.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eLCD Display \u0026amp; Advanced Features:\u003c\/strong\u003e Mid-to-high-end models feature high-definition LCD screens displaying real-time \u003cstrong\u003echarging voltage, charging current, charging time, accumulated capacity, and internal resistance\u003c\/strong\u003e. The \u003cstrong\u003eXTAR VC4H\u003c\/strong\u003e features a tachometer-style LCD display with energy-saving backlight, while the \u003cstrong\u003eLiitoKala Lii-600\u003c\/strong\u003e offers capacity testing and IR detection functions.\u003c\/li\u003e\n    \u003c\/ul\u003e\n\n    \u003ch3\u003eProtected 21700 Charger vs. Standard 21700\/18650 Charger\u003c\/h3\u003e\n    \u003ctable style=\"border-collapse: collapse; width: 100%; border: 1px solid #e0e0e0; margin-bottom: 20px;\"\u003e\n      \u003cthead\u003e\n        \u003ctr style=\"background-color: #f8f9fa;\"\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eParameter\u003c\/th\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eProtected 21700 Charger (This Collection)\u003c\/strong\u003e\u003c\/th\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eStandard 21700 Charger\u003c\/th\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eStandard 18650 Charger\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eMax Length Compatibility\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e≥76mm\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e~70mm–72mm\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e~65mm–67mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eProtected 21700 Compatible\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e✅ Yes (explicitly supported)\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e⚠️ Some models (verify length)\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e❌ No (too short)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eTypical Charge Current\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e0.5A–3A adjustable\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e0.5A–2A\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e0.25A–1A\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003e0V Activation\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e✅ Available on many models\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e⚠️ Some models\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e⚠️ Some models\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eSupported Cells\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e10440–32650 + AA\/AAA\/C\/D\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e14500–21700\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e10440–18650\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eRecommended For\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eProtected 21700 primary users\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eStandard 21700 primary users\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e18650 primary users\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n\n    \u003ch3\u003ePopular Protected 21700 Charger Models – Quick Reference\u003c\/h3\u003e\n    \u003ctable style=\"border-collapse: collapse; width: 100%; border: 1px solid #e0e0e0; margin-bottom: 20px;\"\u003e\n      \u003cthead\u003e\n        \u003ctr style=\"background-color: #f8f9fa;\"\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eCategory\u003c\/th\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eModel\u003c\/th\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eBays\u003c\/th\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eCharge Current\u003c\/th\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eProtected 21700 Support\u003c\/th\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eKey Features\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003e2-Bay Fast Charger\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eXTAR SC2\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e2\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e2A×2 \/ 3A×1\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e✅ Explicitly supports protected 20700\/21700\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eQC3.0 fast charge, 0V activation, TC-CC-CV three-stage\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003e2-Bay Portable\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eXTAR MC2\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e2\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e1A×2\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e✅ Supports protected 21700\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eType-C input, 0V activation, compact and portable\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003e2-Bay Digital\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eXTAR VC2SL\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e2\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e1A×2 \/ 2A×1\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e✅ Supports protected 21700\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eIR detection, power bank function, 0V activation\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003e2-Bay Digital\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eXTAR FC2\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e2\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e0.5A\/1A\/2A selectable\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e✅ Supports protected 21700\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eManual current selection, 0V activation, TC-CC-CV\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003e2-Bay Portable\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eNitecore UI2\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e2\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e1A×2\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e✅ Supports protected 21700\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eUSB-C input, ultra-light 79.5g, independent channels\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003e4-Bay Smart\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eXTAR VC4H\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e4\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e2A×2 \/ 1A×4\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e✅ Supports protected 21700\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eQC3.0, tachometer LCD, charges 4×21700 simultaneously\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003e4-Bay Smart\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eNitecore Ci4\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e4\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eUp to 3A×1\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e✅ Supports 21700\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eQC\/PD input, Li-ion + NiMH\/NiCd, auto-detection\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003e8-Bay Analyzer\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eXTAR VC8S\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e8\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e1A×8\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e✅ Supports 8× protected 21700\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eQC3.0, capacity testing\/grading mode, 8 independent channels\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003e4-Bay Analyzer\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eLiitoKala Lii-600\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e4\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e0.5A–2A selectable\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e✅ Supports 21700\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eCapacity testing, IR detection, storage mode, refresh function\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n\n    \u003ch3\u003eTypical Specifications Range (Protected 21700 Chargers)\u003c\/h3\u003e\n    \u003ctable style=\"border-collapse: collapse; width: 100%; border: 1px solid #e0e0e0; margin-bottom: 20px;\"\u003e\n      \u003cthead\u003e\n        \u003ctr style=\"background-color: #f8f9fa;\"\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eParameter\u003c\/th\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eTypical Range\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eInput Power\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eUSB 5V \/ Type-C \/ QC3.0 \/ PD \/ DC 12V\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eCharge Cutoff Voltage\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e4.2V ±0.05V (Li-ion)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eCharge Current Range\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e0.1A – 3A (adjustable\/adaptive)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eMax Battery Length\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e≥76mm (protected 21700 compatible)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eSupported Cell Sizes\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e10440 \/ 14500 \/ 16340 \/ 17500 \/ 18350 \/ 18650 \/ 20700 \/ 21700 \/ 26650 \/ 32650 \/ AA \/ AAA \/ C \/ D\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eProtection Features\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eOvercharge, over-discharge, overcurrent, short-circuit, reverse polarity, overheat, charge timeout\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eDisplay Type\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eLED indicators \/ LCD digital display\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e\u003cstrong\u003eSpecial Functions\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e0V activation, IR detection, capacity testing, refresh function\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n\n    \u003ch3\u003eTypical Applications\u003c\/h3\u003e\n    \u003ctable style=\"border-collapse: collapse; width: 100%; border: 1px solid #e0e0e0; margin-bottom: 20px;\"\u003e\n      \u003cthead\u003e\n        \u003ctr style=\"background-color: #f8f9fa;\"\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eApplication Scenario\u003c\/th\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eRecommended Charger\u003c\/th\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eWhy\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eTravel \/ on-the-go charging for protected 21700 flashlight cells\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e2-bay portable (XTAR MC2 \/ Nitecore UI2)\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eUltra-light, USB plug-and-charge, explicit protected 21700 support\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eDaily home use, charging 1–2 protected 21700 cells\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e2-bay digital charger (XTAR FC2 \/ VC2SL)\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eReal-time data display, adjustable current, secure fit\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eMulti-device user; mix charge protected 21700, 18650, NiMH\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e4-bay smart charger (XTAR VC4H \/ Nitecore Ci4)\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eMulti-size \u0026amp; multi-chemistry compatible, one charger does it all\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eProfessional user; need capacity \u0026amp; IR testing for cell matching\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e4\/8-bay analyzer charger (LiitoKala Lii-600 \/ XTAR VC8S)\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eCapacity testing, IR detection, grading mode\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eNeed fast charging for protected 21700 to minimize downtime\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e2-bay fast charger (XTAR SC2 \/ Nitecore Ci4)\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e2A–3A fast charging, QC\/PD support\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eBulk charging for workshops \/ rental equipment \/ events\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e8-bay analyzer charger (XTAR VC8S)\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e8 independent channels, supports 8× protected 21700 simultaneously\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n\n    \u003ch3\u003eHow to Choose the Right Protected 21700 Charger?\u003c\/h3\u003e\n    \u003ctable style=\"border-collapse: collapse; width: 100%; border: 1px solid #e0e0e0; margin-bottom: 20px;\"\u003e\n      \u003cthead\u003e\n        \u003ctr style=\"background-color: #f8f9fa;\"\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eYour Requirement\u003c\/th\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eRecommended Type\u003c\/th\u003e\n          \u003cth style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eSuggested Model\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eI only charge protected 21700 cells and need maximum portability\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e2-bay USB portable\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eXTAR MC2, Nitecore UI2\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eI want real-time charging data and adjustable current\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e2-bay digital charger\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eXTAR FC2, XTAR VC2SL\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eI have multiple cell types (protected 21700\/18650\/NiMH) and need one universal charger\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e4-bay smart charger\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eXTAR VC4H, Nitecore Ci4\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eI need fast charging (2A–3A) for protected 21700 cells\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e2\/4-bay fast charger\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eXTAR SC2, Nitecore Ci4\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eI need to test capacity and IR for cell matching\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e4\/8-bay analyzer charger\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eLiitoKala Lii-600, XTAR VC8S\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eI need to charge multiple protected 21700 cells (4+) simultaneously\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e8-bay analyzer charger\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eXTAR VC8S\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eI need bulk quantities or custom charging solutions\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003eContact our sales team\u003c\/td\u003e\n          \u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; text-align: left; vertical-align: middle;\"\u003e—\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n\n    \u003ch3\u003e⚠️ Protected 21700 Charger Safety Guidelines\u003c\/h3\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cstrong\u003eVerify Protected 21700 Compatibility Before Purchase:\u003c\/strong\u003e Protected 21700 cells measure ~74–76mm in length. Before purchasing, confirm the charger's maximum compatible length is ≥76mm and that the product explicitly states support for \"protected 21700\" or \"protected button-top 21700\". Some chargers (e.g., SkyRC MC3000) do not fit protected 21700 cells.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eUse Only Li-ion Compatible Chargers:\u003c\/strong\u003e Protected 21700 cells are 3.6V\/3.7V Li-ion with a 4.2V full charge voltage. \u003cstrong\u003eNever charge them with a NiMH\/NiCd charger\u003c\/strong\u003e—the different voltage and termination methods can damage the protection circuit or create a safety hazard.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eSelect Appropriate Charge Current:\u003c\/strong\u003e Protected 21700 cells charge best at 0.5A–2.0A. While fast charging at 2A–3A is possible with compatible chargers, it's recommended to occasionally use lower currents (0.5A–1A) for battery maintenance to extend cycle life.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eWatch Polarity – Especially with Button-Top Cells:\u003c\/strong\u003e Button-top cells have a raised positive terminal. Ensure proper orientation when inserting—the positive terminal must contact the charger's positive contact. Reverse polarity protection will prevent damage, but correct insertion is always safest.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eAvoid Extreme Temperature Charging:\u003c\/strong\u003e The ideal charging temperature for Li-ion batteries is \u003cstrong\u003e10°C–45°C\u003c\/strong\u003e. \u003cstrong\u003eNever charge batteries below freezing (0°C\/32°F)\u003c\/strong\u003e—this can cause permanent, dangerous metallic lithium plating inside the cell. Keep away from heat sources and direct sunlight.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eRemove After Full Charge:\u003c\/strong\u003e Although smart chargers feature auto-termination, prolonged connection to power may still affect battery longevity. Remove batteries promptly after charging.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eDon't Mix Aged and New Cells:\u003c\/strong\u003e Even if the charger supports independent channels, avoid charging a brand new 21700 and a heavily used 18650 at full current simultaneously. The voltage and internal resistance differences are too large and can affect charging accuracy.\u003c\/li\u003e\n    \u003c\/ul\u003e\n\n    \u003ch3\u003eWhy Choose Our Protected 21700 Chargers?\u003c\/h3\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cstrong\u003eGenuine Brand Products:\u003c\/strong\u003e Chargers from XTAR, Nitecore, ANSMANN, EBL, LiitoKala, and other global professional brands—reliable quality with full safety certifications.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003ePrecisely Compatible with Protected 21700:\u003c\/strong\u003e Curated selection of models explicitly supporting the longer 74–76mm length of protected button-top 21700 cells—eliminates compatibility issues.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eMulti-Chemistry \u0026amp; Multi-Size Support:\u003c\/strong\u003e Select models support Li-ion, NiMH, and LiFePO₄ batteries across sizes from 10440 to 32650 and AA\/AAA\/C\/D—one charger for all your needs.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eAdvanced Features for Battery Health:\u003c\/strong\u003e 0V activation rescues over-discharged cells; IR detection and capacity testing enable professional cell matching.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eOne-Stop Shopping:\u003c\/strong\u003e Protected 21700 batteries, chargers, and accessories all in one place—save time and effort.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eFlexible Purchasing:\u003c\/strong\u003e Single-unit retail and bulk wholesale options available for both individual and enterprise needs.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eCertified \u0026amp; Safe:\u003c\/strong\u003e CE, FCC, RoHS, and UL certifications ensure quality and safety.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eExpert Technical Support:\u003c\/strong\u003e Guidance on charger selection, usage tips, and after-sales support.\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \u003cp\u003e👇👇👇 Browse the product list below to find the perfect \u003cstrong\u003eProtected 21700 Charger\u003c\/strong\u003e for your needs. For volume quotes or technical inquiries, please contact our customer service team.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/details\u003e","products":[{"product_id":"xtar-sc2-intelligent-usb-c-qc-pd-quick-battery-charger-dual-slot-for-li-ion-18650-18700-20700-21700-22650-2665020700-and-21700-batteries-with-protection-boards-batteries","title":"XTAR SC2 2-Bay 3A Fast Smart Battery Charger | Type-C QC3.0 for 3.6V\/3.7V Li-ion 18650 21700 Protected Cells","description":"\u003ch2\u003e\u003cspan class=\"\"\u003eProduct Description\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eThe XTAR SC2 is a highly efficient and ultra-compact 2-slot smart battery charger specifically designed for 3.6V\/3.7V lithium-ion batteries. Powered by a QC3.0 Type-C input, it supports an impressive 3A maximum single-slot charging current, enabling you to fully charge a 3500mAh 18650 battery in just 1.5 hours—three times faster than standard 1A chargers. Featuring an intelligent power adaptation system, the SC2 automatically detects the input power source (5V\/9V\/12V) and adjusts the output current for optimal efficiency. With a clear LED indicator system and comprehensive safety protections, the XTAR SC2 delivers a fast, safe, and portable charging experience for your high-drain 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=\"\"\u003eUltra-Fast 3A Charging: Delivers a blazing 3A charging current for a single battery, drastically reducing charging time. Supports dual-slot 2A charging when charging two batteries simultaneously.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQC3.0 Type-C Input: Equipped with a universal Type-C port supporting QC3.0 protocols (5V\/3A, 9V\/2A, 12V\/1.5A), allowing you to power the charger via wall adapters, laptops, power banks, or USB outlets.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eIntelligent Power Adaptation: Built-in smart chip automatically recognizes the current of your power source and matches the optimal charging current for safe and efficient use.\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: The intuitive LED lights indicate precise charging status: 1\/2\/3 lights flashing for 1A\/2A\/3A current; Rolling lights flashing for active charging; 4 lights solid for fully charged or standby; 4 lights flashing simultaneously for reverse polarity protection.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eExtensive Battery Compatibility: Specifically designed to accommodate 3.6V\/3.7V Li-ion batteries, including sizes 18650, 18700, 20700, 21700, 22650, and 26650. \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eImportant:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Supports charging protected 20700 and 21700 batteries securely.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eComprehensive Safety Protection: Built-in short circuit protection, overcharge protection, reverse polarity protection, overcurrent protection, and overvoltage protection. Certified with CE, RoHS, and FCC standards, and insured by China Pacific Insurance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003ePortable \u0026amp; Lightweight: With a compact body measuring 105mm x 53mm x 27mm and weighing just 58g, it is ideal for EDC and travel use.\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=\"\"\u003eModel: XTAR SC2\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eInput Power: QC3.0 Type-C (5V⎓3A \/ 9V⎓2A \/ 12V⎓1.5A)\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: 2A x 2 (Dual slot) \/ 3A x 1 (Single slot)\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: 4.20 ± 0.05V\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: ≤150mA\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 - 40°C\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eProduct Dimensions: 105mm (L) x 53mm (W) x 27mm (H)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eNet Weight: 58g\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)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eSupported Sizes: 18650, 18700, 20700, 21700, 22650, 26650 (Supports protected 20700 \u0026amp; 21700)\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=\"\"\u003eFast charging for high-drain 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=\"\"\u003eReliable portable charging solution for outdoor headlamps and camping lanterns.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003ePower maintenance for remote control (RC) hobbies, 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=\"\"\u003eCompact emergency backup charger for power banks and DIY battery packs.\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 the package?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA1: The package includes 1x XTAR SC2 Smart Charger, 1x Type-C Charging Cable, and 1x User Manual. (Batteries are sold separately).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ2: Can the SC2 charge protected 21700 batteries?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA2: Yes. The XTAR SC2 features an extended slot design that comfortably accommodates protected 20700 and 21700 batteries, unlike many other compact chargers.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ3: How do I achieve the 3A fast charging speed?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA3: To achieve the maximum 3A charging speed, use a single battery in one slot and ensure your power adapter supports QC3.0 (9V\/2A or 12V\/1.5A). The SC2 will automatically detect the input power and adjust to 3A.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ4: What do the LED lights indicate?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA4: 1\/2\/3 blinking lights indicate the charging current is 1A\/2A\/3A. Rolling lights indicate the battery is charging. 4 solid lights mean it is fully charged. 4 flashing lights at once means the battery is inserted backwards (reverse polarity protection activated).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ5: Is the SC2 safe to use overnight?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA5: Absolutely. The SC2 includes multiple safety protections including overcharge protection. Once the battery reaches the precise 4.20V cut-off voltage, charging will stop automatically to prevent overcharging.\u003c\/span\u003e\u003c\/p\u003e","brand":"XTAR","offers":[{"title":"Default Title","offer_id":51454131536118,"sku":"OAS260","price":15.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/xtar-sc2-qc-pd-dual-slot-fast-charger-main_7b7e8ba0-629e-4d0e-8cab-366cb35b9f57.webp?v=1786965455"},{"product_id":"xtar-vc4h-18650-battery-charger-4-bay-3a-battery-charger-with-smart-lcd-display-fast-charge-for-rechargeable-batteries-li-ion-ni-mh-ni-cd-aa-aaa-c-21700-26650-13650-16340-18350-18700-rcr123","title":"XTAR VC4H 4-Bay Smart Battery Charger | 2A Fast Charge with LCD Display for 3.6V\/3.7V Li-ion 18650 21700 \u0026 1.2V Ni-MH AA AAA","description":"\u003ch2\u003e\u003cspan class=\"\"\u003eProduct Description\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eThe XTAR VC4H is a high-performance upgraded 4-slot smart battery charger designed for both 3.6V\/3.7V Li-ion and 1.2V Ni-MH\/Ni-CD batteries. Equipped with a modern QC3.0 Type-C input, it delivers a fast 2A charging current for two slots simultaneously or 1A for all four slots. Unlike previous models, the VC4H features an extended slot design that specifically supports protected 20700 and 21700 batteries. The intuitive LCD gauge screen provides real-time visibility of battery voltage, current, charged capacity (mAh), battery type, and channel information. With advanced 0V activation, intelligent TC-CC-CV and pulse charging algorithms, and comprehensive safety protections, the XTAR VC4H is an ideal, practical, and upgraded charging station for your diverse battery collections.\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=\"\"\u003eUpgraded Extended Slots: Specifically designed to safely accommodate and charge protected 20700 and 21700 batteries, offering superior versatility over standard chargers.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eIntelligent LCD Gauge Display: The clear, innovative screen displays essential real-time data, including battery voltage, charging current gear, charged capacity (mAh), battery type (Li-ion or Ni-MH), and slot number.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQC3.0 Fast Type-C Input: Features a universal Type-C port supporting QC3.0 protocols (5V\/3A, 9V\/2A). Allows for efficient charging with a 2A current for 2 slots simultaneously (2Ax2) or 1A for all 4 slots (1Ax4) for 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=\"\"\u003eSmart Charging Algorithms: Automatically identifies battery types and applies the optimal charging strategy: Unique TC-CC-CV (Trickle-CC-CV) for Li-ion batteries, and precise pulse charging with 0ΔV and -ΔV cut-off detection for Ni-MH\/Ni-CD batteries to ensure a full charge and protect battery lifespan.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003e0V Activation Technology: Built-in 0V activation safely revives and recovers over-discharged lithium batteries, giving new life to depleted cells.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eIntuitive LED Status Lights: Features clear red\/green LED indicators. Red light indicates active charging, self-testing, or activation. Green light indicates standby, fully charged, or reverse polarity protection (please correct immediately).\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eOne-Button Operation \u0026amp; Convenience: Use the \"Curr.\" button to manually switch charging currents. Use the \"Mode\" button to cycle through slot information on the LCD. Press and hold either button for 1.5 seconds to turn off the screen backlight.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eComprehensive Safety Protections: Built-in overcharge, overcurrent, overvoltage, short-circuit, and reverse polarity protection, supported by an intelligent temperature control system for stable and safe charging.\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=\"\"\u003eModel: XTAR VC4H\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eInput Power: QC3.0 Type-C (5V⎓3A \/ 9V⎓2A)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eCharging Current (Li-ion 4.2V): 2A x 1 \/ 2A x 2 \/ 1A x 4\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eCharging Current (Ni-MH 1.45V): 1A x 1 \/ 1A x 2 \/ 1A x 4 \/ 0.5A x 4\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: ≤150mA\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 - 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: L156mm x W115mm x H32mm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eNet Weight: 210g\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\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: AAAA, AAA, AA, A, SC, C, D\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eImportant Upgrade Note:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e This charger supports protected 20700 and 21700 batteries.\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=\"\"\u003eUpgraded daily charging station for EDC tactical flashlights, headlamps, and outdoor gear using protected 21700 cells.\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;\"\u003eEfficient power maintenance and charging for 1.2V AA\/AAA \u003c\/span\u003eNi-MH\u003cspan style=\"background-color: transparent; color: inherit; font-size: inherit; letter-spacing: inherit; text-decoration-line: underline;\"\u003e batteries in digital cameras, remote controls, and wireless devices.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eConvenient mixed charging for both 3.6V Li-ion and 1.2V Ni-MH household batteries.\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, versatile solution for managing a large collection of diverse cylindrical batteries.\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 the package?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA1: The package includes 1x XTAR VC4H Smart Charger, 1x Type-C Charging Cable, 1x User Manual, and 1x Protective Storage Pouch. (Batteries are not included).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ2: Can the VC4H charge protected 20700 and 21700 batteries?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA2: Yes. This is a major upgrade of the VC4H. It is specifically designed with extended slots to safely accommodate protected 20700 and 21700 batteries, unlike many other compact chargers.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ3: What is the maximum charging current of the VC4H?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA3: For Li-ion batteries, the VC4H supports up to a 2A current for a single slot, 2A for two slots simultaneously, or 1A for all four slots simultaneously. For Ni-MH batteries, it supports up to 1A.\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: Red light indicates the battery is charging, undergoing self-testing, or being activated. Green light indicates the charger is in standby mode, the battery is fully charged, or the battery is inserted with reversed polarity. If the light is green and the battery is not full, please check the battery direction.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ5: How do I turn off the screen backlight?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA5: You can simply press and hold either the \"Curr.\" or \"Mode\" button for 1.5 seconds to turn off the LCD backlight. Pressing the button again will turn it back on.\u003c\/span\u003e\u003c\/p\u003e","brand":"XTAR","offers":[{"title":"Default Title","offer_id":51454142906614,"sku":"OAS307","price":31.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/xtar-vc4h-4bay-3a-fast-lcd-charger-main_194076a9-241a-4254-bc2a-e8fac9367542.webp?v=1786965676"},{"product_id":"xtar-vc2l-18650-battery-charger2-bay-lcd-display-2a-smart-universal-charger-for-rechargeable-batteries-ni-mh-ni-cd-aa-aaa-3-7v-li-ion-battery-21700-26650-14500-16650","title":"XTAR VC2L 2-Bay Smart Battery Charger | 2A Fast Charge with Color VA LCD Display for 3.6V\/3.7V Li-ion 18650 21700 \u0026 1.2V Ni-MH AA AAA","description":"\u003ch2\u003e\u003cspan class=\"\"\u003eProduct Description\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eThe XTAR VC2L is a highly capable, redesigned 2-slot smart battery charger that bridges the gap between compact size and upgraded performance. Featuring a vibrant color VA LCD display with an innovative gauge-style interface, it provides clear real-time data on battery voltage, charging current, and charged capacity. The VC2L utilizes an upgraded extendable spring-loaded slot design, specifically engineered to safely accommodate protected 20700 and 21700 batteries—a significant advantage over many standard chargers. With a USB Type-C input, adjustable 2A single-slot fast charging, and intelligent 0V activation, this charger delivers a professional, reliable, and highly compatible charging experience for all your Li-ion and Ni-MH batteries.\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=\"\"\u003eUpgraded Extendable Battery Slots: Features a newly designed spring-loaded bay that securely accommodates a wide range of sizes, including protected 20700 and 21700 batteries, alongside standard 18650 and other cylindrical cells.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eInnovative Color VA LCD Display: Equipped with a high-contrast color screen using a creative gauge-style interface. It clearly displays real-time battery voltage, charging current gear, charged capacity (mAh), and battery type (Li-ion or Ni-MH).\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003e2A Single-Slot Fast Charging: Supports adjustable charging currents: 2A for a single slot, 1A for two slots simultaneously, or 0.5A for two slots simultaneously. This allows you to quickly power up high-capacity batteries.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eSmart Type-C Input: Features a modern USB Type-C port (5V 2.1A), allowing for effortless power connection using standard phone adapters, laptops, power banks, or car chargers.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eIntelligent Charging Algorithms \u0026amp; 0V Activation: Automatically identifies battery types and applies optimized charging strategies: TC-CC-CV (Trickle-CC-CV) for Li-ion batteries, and precise 0ΔV \/ -ΔV pulse charging for Ni-MH\/Ni-CD batteries. Built-in 0V activation safely revives over-discharged batteries.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eComprehensive Safety Protection: Built-in over-current, over-voltage, over-charge, short-circuit, and reverse polarity protection (the screen displays \"Err\" upon reversal). Intelligent temperature control ensures a safe and stable charging process.\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=\"\"\u003eModel: XTAR VC2L\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eInput Power: DC 5V 2.1A (Type-C)\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: 2A x 1 \/ 1A x 2 \/ 0.5A x 2\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: 4.2 ± 0.05V (Li-ion) \/ 1.45 ± 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: ≤150mA\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 - 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: 136 x 63 x 33 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: 115g\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\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: AAAA, AAA, AA, A, SC, C\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eUpgrade Note:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e This charger supports protected 20700 and 21700 batteries.\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=\"\"\u003eUpgraded daily charging station for EDC tactical flashlights and headlamps using protected 21700 cells.\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;\"\u003eEfficient power maintenance for 1.2V AA\/AAA \u003c\/span\u003eNi-MH\u003cspan style=\"background-color: transparent; color: inherit; font-size: inherit; letter-spacing: inherit; text-decoration-line: underline;\"\u003e batteries in digital cameras and remote controls.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eProfessional battery management for high-drain 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=\"\"\u003eAn all-in-one, future-proof charging solution for a wide collection of cylindrical batteries, from small 10440 cells to large 26650 cells.\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: Can the XTAR VC2L charge protected 20700 and 21700 batteries?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA1: Yes. This is one of the VC2L's key upgrades. It features a re-engineered extendable spring-loaded slot specifically designed to safely accommodate protected 20700 and 21700 batteries.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ2: What is the maximum charging current of the VC2L?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA2: The VC2L offers three adjustable charging currents: 2A for a single slot (2Ax1), 1A for two slots simultaneously (1Ax2), and 0.5A for two slots simultaneously (0.5Ax2). You can switch between modes by clicking the button below the screen.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ3: What does the color VA LCD display show?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA3: The innovative gauge-style display provides real-time, easy-to-read information including battery voltage, charging current gear, charged capacity (mAh), and battery type. If a battery is inserted incorrectly, the screen will clearly display \"Err\".\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ4: How does the 0V activation feature work?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA4: If a lithium battery has been over-discharged to an extremely low voltage (near 0V), the VC2L will automatically detect it and apply a safe, low current to gently reactivate the battery's protection circuit, often successfully restoring it to a usable state.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ5: Can I charge a Li-ion and a Ni-MH battery at the same time?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA5: Yes. The VC2L features two completely independent charging circuits. You can safely charge a 3.6V\/3.7V Li-ion battery in one slot and a 1.2V Ni-MH battery in the other slot simultaneously.\u003c\/span\u003e\u003c\/p\u003e","brand":"XTAR","offers":[{"title":"Default Title","offer_id":51454143922422,"sku":"OAS329","price":20.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/xtar-vc2l-lcd-dual-slot-charger-main_6640f2e5-18f7-4a50-be81-6f1066ca460b.webp?v=1786965688"},{"product_id":"vc2sl-18650-battery-chargerlcd-display-charger-for-3-7v-li-ion-battery-18650266502170018500183501-2v-ni-mh-ni-cd-a-aa-aaa-rechargeable-batteries","title":"XTAR MC6C 6-Bay Smart Battery Charger | Dual Type-C \u0026 DC Input for 3.6V\/3.7V Li-ion 18650 21700 \u0026 1.2V Ni-MH AA AAA","description":"\u003ch2\u003e\u003cspan class=\"\"\u003eProduct Description\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eThe XTAR MC6C is a highly efficient 6-slot smart battery charger designed for users who need to charge large quantities of batteries simultaneously. Featuring a dual-input design (Type-C and DC barrel port), it offers incredible flexibility for power sources. The MC6C supports mixed charging of 3.6V\/3.7V Li-ion and 1.2V Ni-MH\/Ni-CD batteries. Its intuitive LED grid display provides clear real-time status of each battery's charging progress, current, and error alerts. With smart current distribution (up to 1.0A for specific slots) and an intelligent 0V activation function to revive over-discharged cells, this charger is a reliable, convenient, and professional choice for bulk battery management. \u003c\/span\u003e\u003cem\u003e\u003cspan class=\"\"\u003e(Note: Does not support protected 20700 and 21700 batteries).\u003c\/span\u003e\u003c\/em\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=\"\"\u003e6 Independent Charging Slots: Supports mixed charging of Li-ion and Ni-MH\/Ni-CD batteries across all slots simultaneously, without mutual interference.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eDual Power Inputs: Features both a modern USB Type-C port and a standard DC barrel port (5V 3A). Provides ultimate flexibility for power connections, usable with phone adapters, power banks, or dedicated DC power supplies.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eSmart LED Grid Status Display: The clear LED indicators show charging status at a glance. The battery frame and power grid flash or stay lit to indicate activation, charging, fully charged, or reverse polarity\/error conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eDifferentiated Charging Currents: Intelligent current allocation. Slots 1, 2, 5, and 6 support up to a 1.0A charging current, while slots 3 and 4 support up to a 0.5A current for optimized bulk charging.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003e0V Activation Function: Built-in 0V activation technology uses a safe 100mA low current to gently revive over-discharged lithium batteries, restoring them to a usable state.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eIntelligent Power Adaptation: Automatically detects the input power source and line conditions to adjust the charging current, ensuring safe and efficient charging based on your adapter's capability.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eComprehensive Safety Protection: Built-in reverse polarity protection, channel short-circuit protection, and over-charge protection to prevent device damage and fire risks from improper battery insertion or internal faults.\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=\"\"\u003eModel: XTAR MC6C\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eInput Power: 5V 3A (Type-C \u0026amp; DC Barrel)\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: 1.0A x 3 \/ 0.5A x 6\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: 4.2 ± 0.05V\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=\"\"\u003eOperating Temperature: 0 - 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 W155.5 x H34 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: 204.8g\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\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: AAAA, AAA, AA, A, SC, C\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eImportant Restriction:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e This charger does NOT support protected 20700 and 21700 batteries.\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=\"\"\u003eBulk charging and maintenance for high-volume 18650\/21700 batteries used in EDC flashlights and tactical gear.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eEfficient batch management and power replenishment for RC drones, model aircraft, and hobby electronics.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eDaily mixed charging for large quantities of 1.2V AA\/AAA Ni-MH batteries in households, schools, and office environments.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eProfessional battery diagnostic and revival station for emergency equipment and outdoor survival kits.\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, efficient charging hub for users managing multiple battery types and sizes.\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 XTAR MC6C support protected 20700 and 21700 batteries?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA1: No. The MC6C is physically compatible with 20700 and 21700 sizes, but it specifically DOES NOT support protected 20700 and 21700 batteries due to length restrictions. Please do not use protected versions of these cells with this charger.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ2: What are the charging currents for the different slots?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA2: The MC6C intelligently allocates current. Slots 1, 2, 5, and 6 can charge at up to 1.0A, while slots 3 and 4 charge at up to 0.5A. When charging Ni-MH batteries, it uses a default 0.5A current.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ3: What do the LED grid lights indicate?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA3: Slow flashing battery frame: Activation or battery identification. Steady frame with flowing grid: Charging in progress. Steady frame and 4 steady grids: Fully charged. Fast flashing frame and grid: Reverse polarity, activation failure, or abnormal status.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ4: How does the 0V activation function work?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA4: If a lithium battery is over-discharged to near 0V and cannot be recognized by standard chargers, the MC6C will automatically apply a safe, low 100mA current to activate the battery's protection circuit, often successfully reviving it. Note: The LED will flash slowly during this activation period.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eQ5: Can I use the Type-C and DC ports at the same time?\u003c\/span\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA5: You can use either port independently. The charger will adapt to whichever power source is connected. The input requirement is 5V 3A for optimal performance across all 6 slots.\u003c\/span\u003e\u003c\/p\u003e","brand":"XTAR","offers":[{"title":"Default Title","offer_id":51454144119030,"sku":"OAS336","price":32.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/xtar-vc2sl-lcd-dual-slot-charger-main_20c77293-66f8-4f81-b30e-d410cc7c28a7.webp?v=1786965691"},{"product_id":"xtar-mc2-2-slot-battery-charger-1a-constant-current-usb-charger-for-18650-21700-26650-more-supports-protected-21700","title":"XTAR MC2 2-Slot Battery Charger – 1A Constant Current USB Charger for 18650, 21700, 26650 \u0026 More (Supports Protected 21700)","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"5:1-5:12;108-119\"\u003eOverview\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"7:1-7:421;121-541\"\u003eThe XTAR MC2 is a compact, two-slot USB charger for cylindrical lithium-ion cells, covering everything from small 10440s up to 26650s and protected 21700 cells. It charges both slots at a full 1A simultaneously — no current-splitting penalty for using both bays at once — and uses a 3-stage charging process (trickle, constant current, constant voltage) to bring cells to a full, stable charge without overcharging them.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"9:1-9:183;543-725\"\u003eIt's built for people who want a genuinely portable charger that doesn't force a trade-off between size and charge speed: small enough to carry in a bag, fast enough for regular use.\u003c\/p\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"11:1-11:14;727-740\"\u003eFull Specs\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"13:1-29:104;742-1781\"\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\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMC2\u003c\/td\u003e\n\u003c\/tr\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\"\u003eType-C, 5V⎓2A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharging Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e1A per slot (both slots simultaneously — 1A x1 or 1A x2, not shared)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharging Method\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3-stage: trickle charge → 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\"\u003eEnd-of-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 ±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\"\u003eEnd-of-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\"\u003e\u0026lt;130mA 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\"\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e0°C to 40°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\"\u003eDimensions\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eL103mm x W53mm x H30mm\u003c\/td\u003e\n\u003c\/tr\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\"\u003e54g\u003c\/td\u003e\n\u003c\/tr\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 Chemistry\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\/3.7V lithium-ion (Li-ion\/IMR\/INR\/ICR)\u003c\/td\u003e\n\u003c\/tr\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, 14500, 14650, 16340, 17335, 17500, 17670, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22650, 25500, 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\"\u003eProtected Cell Support\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eYes — supports protected 21700 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\"\u003eSpecial Feature\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\"0V\" activation technology for recovering some over-discharged 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\"\u003eStatus Indicators\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eGreen = standby or fully charged; Red = actively charging; Off\/unlit = reverse polarity or abnormal insertion\u003c\/td\u003e\n\u003c\/tr\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 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 protection, short-circuit protection, automatic charge cutoff\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"31:1-31:43;1783-1825\"\u003eHow the Charging Process Actually Works\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"33:1-33:97;1827-1923\"\u003eThe MC2 doesn't just dump current into a cell and stop — it moves through three distinct stages:\u003c\/p\u003e\n\u003col 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-decimal flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"35:1-37:213;1925-2475\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"35:1-35:143;1925-2067\"\u003e\n\u003cstrong\u003eTrickle charge\u003c\/strong\u003e — a small preliminary current tops off and, where applicable, helps activate a deeply discharged cell before ramping up.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"36:1-36:195;2068-2262\"\u003e\n\u003cstrong\u003eConstant current\u003c\/strong\u003e — the charger increases and holds a steady current while the cell's voltage climbs; this is where most of the capacity gets restored, and it's the fastest-charging phase.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"37:1-37:213;2263-2475\"\u003e\n\u003cstrong\u003eConstant voltage\u003c\/strong\u003e — as the cell approaches full charge, the charger holds voltage steady and gradually reduces current, topping off the last portion of capacity without pushing the cell past a safe voltage.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"39:1-39:203;2477-2679\"\u003eThis is standard, sound practice for lithium-ion charging — it's what protects cell longevity better than a charger that just charges at a flat current until it hits a voltage cutoff and stops abruptly.\u003c\/p\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"41:1-41:45;2681-2725\"\u003eWhat Makes This Charger Worth Considering\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=\"43:1-46:246;2727-3906\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"43:1-43:297;2727-3023\"\u003e\n\u003cstrong\u003eReal 1A per slot, no splitting\u003c\/strong\u003e — plenty of basic dual-slot chargers cut each slot's current in half when both bays are occupied. The MC2 doesn't do that: each slot gets a full 1A regardless of whether the other is in use, so a typical 18650 charges in a few hours rather than most of a day.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"44:1-44:411;3024-3434\"\u003e\n\u003cstrong\u003e0V activation\u003c\/strong\u003e — most basic chargers simply refuse to recognize a cell that's been discharged too far below its normal cutoff voltage. The MC2's activation function can attempt a slow, controlled recovery charge on some of these cells rather than treating them as dead on arrival. It won't save every over-discharged cell — some genuinely are beyond recovery — but it gives borderline cells a real chance.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"45:1-45:226;3435-3660\"\u003e\n\u003cstrong\u003eBroad size compatibility\u003c\/strong\u003e — from small 10440s (common in flashlights and ) up through 26650s, plus protected 21700 cells, this one charger covers most of the cylindrical lithium-ion formats you're likely to own.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"46:1-46:246;3661-3906\"\u003e\n\u003cstrong\u003eSimple status reporting\u003c\/strong\u003e — the LED colors are unambiguous: green means it's either standing by or done, red means it's actively working, and no light at all is the charger telling you something's inserted wrong before it does anything else.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"48:1-48:24;3908-3931\"\u003eWhat to Keep in Mind\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=\"50:1-52:190;3933-4680\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"50:1-50:368;3933-4300\"\u003e\n\u003cstrong\u003eThis charges bare cells only in the sense that it doesn't manage discharge-side protection.\u003c\/strong\u003e The MC2 handles charging safely (voltage\/current cutoffs, reverse polarity, short circuit), but if you're using unprotected cells in a device, that device still needs its own low-voltage cutoff — the charger's protections don't extend to how the cell is used afterward.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"51:1-51:190;4301-4490\"\u003e\n\u003cstrong\u003eOperating temperature matters.\u003c\/strong\u003e Charging outside the 0-40°C range isn't something this charger is rated to handle safely — keep it somewhere reasonable, not in direct sun or a hot car.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"52:1-52:190;4491-4680\"\u003e\n\u003cstrong\u003eTwo different cell sizes at once is fine.\u003c\/strong\u003e Because the slots operate independently with automatic detection, you can charge, say, one 18650 and one 21700 side by side without an issue.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"54:1-54:30;4682-4711\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"56:1-57:243;4713-5014\"\u003e\u003cstrong\u003eQ: How long does it take to fully charge a typical 18650?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"56:1-57:243;4713-5014\"\u003eA: At a full 1A, a 2,500-3,000mAh 18650 typically reaches full charge in roughly 3-4 hours, accounting for the tapering constant-voltage stage near the end. Larger cells (21700, 26650) will take proportionally longer given their higher capacity.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"59:1-60:122;5016-5195\"\u003e\u003cstrong\u003eQ:Does charging two cells at once slow either one down?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"59:1-60:122;5016-5195\"\u003eA: No. Each slot delivers its own full 1A independently — you're not splitting a shared current budget between the two bays.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"62:1-63:196;5197-5429\"\u003e\u003cstrong\u003eQ: Can this charge protected cells?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"62:1-63:196;5197-5429\"\u003eA: Yes, it supports protected 21700 cells. For other protected cell sizes, check the cell's own spec sheet — protection circuits vary and some add length that may not fit every charger's slot depth.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"65:1-66:164;5431-5657\"\u003e\u003cstrong\u003eQ: What does it mean if a slot's LED doesn't light up at all?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"65:1-66:164;5431-5657\"\u003eA: That typically indicates a reverse-polarity insertion or another abnormal condition the charger has detected. Remove the cell, check its orientation, and reinsert.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"68:1-69:277;5659-5997\"\u003e\u003cstrong\u003eQ: Is the \"0V activation\" feature safe to rely on regularly?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"68:1-69:277;5659-5997\"\u003eA: It's meant as a recovery option for occasional over-discharge situations, not a substitute for storing and using cells properly in the first place. A cell that repeatedly needs 0V activation is showing signs of wear or misuse and is worth watching more closely — or replacing.\u003c\/p\u003e","brand":"XTAR","offers":[{"title":"Default Title","offer_id":51454215454966,"sku":"OAS1368","price":14.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/xtar-mc2-main-hero-2slot-charger_815327cb-3adf-4636-b836-db407092465e.webp?v=1786968308"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/collections\/3.6V_25fb814c-4f2e-466a-8664-e9e2773af7e1.jpg?v=1786687341","url":"https:\/\/oneandes.com\/collections\/protected-21700-charger.oembed","provider":"OneAndes","version":"1.0","type":"link"}