ON THE WAY&reg;2Pcs White 18650 3.7V 3800mAh Rechargeable Lithium Battery and 18650 battery Charger with PCB for LED Flashlight, Headlamps, Search Light Lamp, etc 18650 Rechargeable Li-Ion battery with IC Protection With overcharge / discharge protection function that you can use it without worry. High energy density, long life battery. Charges 1 or 2 batteries simultaneously. This 18650 battery is compatible with various kind of flashlight and LED headlamps, bike lights. This battery has an extra long life and provides excellent continuous power sources for your device.