Compact 18650 Li-ion rechargeable battery kit includes four 3.7V cells and a two-slot USB charger. Charger measures 2.55 x 2.55 x 0.7 inches, built with a lightweight, portable design for on-the-go power. Blue housing with smart charging circuits delivers convenient, reliable energy for compatible devices. USB input works with any standard USB port: wall adapters, power banks, or computer ports. Intelligent charge management monitors each cell and automatically stops when full, preventing overcharging. Advanced safety features include overvoltage, overcurrent, short circuit, and reverse polarity protection, plus zero-volt battery repair for deeply discharged cells. Efficient heat dissipation keeps the unit cool during operation. No memory effect means you can top off batteries at any time without reducing capacity. Ideal for flashlights, headlamps, and other 18650-compatible electronics. This set provides a practical power solution for outdoor activities, emergencies, and daily use, ensuring your gear is always ready.
Charge via any USB port for flexible power access
Automatically stops charging when batteries are full
Built-in overvoltage, overcurrent, and short circuit protection
Compact 2.55-inch square design for easy portability
Revives over-discharged cells with zero-volt repair function