Universal 2-Slot USB Fast Charger for 3.7V Lithium-ion Batteries
Dual-slot fast charging for 18650, 8650, 10440, 14500, 16340, 17650, and 18500 batteries with intelligent IC chip protection. Premium ABS+PC fireproof casing ensures durability and heat dissipation while safeguarding against overcharge, overcurrent, and short circuits. Compact and portable design with USB 5V/1A output, ideal for powering flashlights, vaping devices, DIY electronics, and emergency backup solutions. Universal compatibility with 36-40mm battery lengths and automatic polarity detection for hassle-free operation. Engineered with gold-plated contacts for minimal resistance and maximum charging efficiency. Perfect for hobbyists, professionals, and everyday users needing reliable, fast-charging on the go.