Single Slot 3.7V Smart Li-ion Battery Charger Fit 18650 21700 14500 16340

Keep your high-drain tactical gear and specialty electronics powered with this Single-Slot 3.7V Smart Lithium Battery Charger! Specially engineered with an adjustable spring slider bay, this versatile USB charger safely powers a wide range of 3.7V cylindrical lithium-ion cells—including popular sizes like 18650, 21700, 18490, 17500, 18350, 16340 (CR123A), 14500, and 10440. Equipped with a clear LED status indicator light, it switches from red to green to give you instant visual notification when charging is complete. Featuring a compact USB power interface, it plugs easily into standard phone chargers, power banks, or laptops. Built with intelligent microchip safeguards against over-charging, reverse polarity insertion, and short circuits, it offers safe, travel-friendly single-cell charging anywhere.

Key Features

• Universal 3.7V Li-ion battery support adjustable spring slider bay fits 18650, 21700, 18490, 17500, 18350, 16340, 14500, and 10440 cells

• Clear LED status indicator dual-color LED turns from red during active charging to solid green upon full charge completion

• Universal USB power interface flexible 5V USB input connects effortlessly to power banks, wall adapters, laptops, or car blocks

• Integrated microchip safety system automatically prevents over-charging, short-circuiting, reverse polarity damage, and thermal overload

• Ultra-compact & travel-ready lightweight, pocket-sized construction ideal for outdoor packs, bug-out bags, and travel kits

Why Choose Our Single-Slot Smart Charger

Unlike bulky multi-bay charging stations, this portable single-slot charger is designed for maximum versatility and portability. Its heavy-duty spring slider accommodates both flat-top and button-top 3.7V cells ranging from small 10440s up to large-format 21700 batteries.

Perfect For

• Recharging single 3.7V lithium batteries for LED tactical flashlights, laser pointers, vaping devices, and headlamps

• Powering specialty lithium cells used in wireless doorbells, RC gadgets, and portable fan units

• Keeping an ultra-lightweight backup lithium charger in camping gear, glove boxes, or emergency preparedness kits

Specifications

• Design: Single-Slot Adjustable Smart Fast USB Lithium-Ion Battery Charger

• Battery Compatibility: 3.7V Li-ion Cells (18650, 21700, 18490, 17500, 18350, 16340, 14500, 10440)

• Power Input: Universal USB 5V Interface

• Status Display: Dual-Color LED Indicator (Charging / Full Charge)

• Safety Features: Overcharge Protection, Short-Circuit Defense & Reverse Polarity Cut-Off

• Ideal Uses: Tactical Flashlights, Outdoor Camping, Headlamps, Emergency Preparedness, Travel

Keep your 3.7V lithium batteries ready for action—claim your single-slot smart USB charger today.