{"product_id":"usb-smart-lithium-battery-charger-1-2-4-slot-18650-21701","title":"USB Smart Lithium Battery Charger 1\/2\/4 Slot 18650 21700","description":"\u003ch2\u003eUSB Smart Lithium Battery Charger – 1, 2 \u0026amp; 4 Slot for 18650, 21700 \u0026amp; More\u003c\/h2\u003e\n\n\u003cp\u003eKeep your rechargeable batteries topped up and ready to go with this compact, smart USB lithium battery charger. Compatible with a wide range of cylindrical battery formats — including 18650, 21700, 10400, 14500, 16340, 16650, and 14650 — this versatile charger is an essential addition to any home, workshop, or travel kit.\u003c\/p\u003e\n\n\u003cp\u003eDesigned for everyday convenience, it connects to any standard USB power source, including mobile phone chargers and power banks, so you're never far from a full charge. The intelligent charging circuit manages low-voltage input for safe, efficient charging every time. Available in your choice of 3 colors to match your style.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e1, 2 \u0026amp; 4 Slot Configurations:\u003c\/strong\u003e Choose the slot count that suits your needs — charge one battery or four simultaneously.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Battery Compatibility:\u003c\/strong\u003e Supports 18650, 21700, 10400, 14500, 16340, 16650, 14650, and more lithium battery types.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUSB Powered:\u003c\/strong\u003e Connects directly to USB power adapters, power banks, laptops, or car USB ports — no proprietary charger required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSmart Charging Circuit:\u003c\/strong\u003e Built-in protection monitors the charging process for safe, low-voltage operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Portable:\u003c\/strong\u003e Lightweight shell design makes it easy to stow in a bag, drawer, or travel kit.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3 Color Options:\u003c\/strong\u003e Pick the look that works for you.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUSB Cable Included:\u003c\/strong\u003e Ready to charge right out of the box.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × USB Smart Lithium Battery Charger (1, 2, or 4-slot configuration)\u003c\/li\u003e\n  \u003cli\u003e1 × USB Charging Cable\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatible Battery Types\u003c\/h3\u003e\n\u003cp\u003e18650 | 21700 | 10400 | 14500 | 16340 | 16650 | 14650 lithium batteries\u003c\/p\u003e\n\n\u003cp\u003eFor guidance on safe rechargeable battery use and handling, visit the U.S. Consumer Product Safety Commission (CPSC) Battery Safety page.\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Battery_charger\" target=\"_blank\" rel=\"noopener\"\u003eBattery charger\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003ch4\u003eQ: What battery sizes does this USB smart charger support?\u003c\/h4\u003e\n\u003cp\u003eA: This smart lithium battery charger is compatible with a wide range of cylindrical lithium batteries, including 18650, 21700, 10400, 14500, 16340, 16650, and 14650 formats — making it one of the most versatile USB battery chargers available.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What USB power sources can I use with this charger?\u003c\/h4\u003e\n\u003cp\u003eA: The charger works with any standard USB power source — including mobile phone wall adapters, power banks, laptop USB ports, and even car USB chargers. No proprietary power supply is needed.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this charger safe to leave unattended while charging?\u003c\/h4\u003e\n\u003cp\u003eA: The built-in smart charging circuit regulates input voltage and monitors the charging process to help ensure safe operation. As with all battery chargers, it is best practice to charge in a well-ventilated area and check on your batteries periodically.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How many batteries can I charge at once?\u003c\/h4\u003e\n\u003cp\u003eA: Depending on the slot configuration you select (1, 2, or 4 slot), you can charge one to four batteries simultaneously, making this charger ideal for households or users with multiple devices powered by lithium batteries.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What battery sizes does this USB smart charger support?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This smart lithium battery charger is compatible with a wide range of cylindrical lithium batteries, including 18650, 21700, 10400, 14500, 16340, 16650, and 14650 formats — making it one of the most versatile USB battery chargers available.\"}}, {\"@type\": \"Question\", \"name\": \"What USB power sources can I use with this charger?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The charger works with any standard USB power source — including mobile phone wall adapters, power banks, laptop USB ports, and even car USB chargers. 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