Keep your flashlight or other devices working with the ARE-X11 18650 Battery Charging Kit from Fenix Flashlight that holds one Li-ion 18650 battery, which has an output power of 3.6V and a capacity of 3500mAh. The included cable plugs into the charger's micro USB charging port and powers the cell from either a laptop, power bank, or solar panel.
During the charging process, the built-in microchip regulates the output, which extends the battery life, and also protects the battery from over-current, over-voltage, reverse-polarity, and from short-circuits. Four charging status LEDs light up one at a time until the battery reaches full capacity, and the battery protection cover hides the battery during the progress. With the Li-ion battery fully charged inside the charger, it can charge other devices like your smartphone, digital watch, or headset though the standard USB port.