Worldoor&reg; Super big capacity 4 PCS 3.7V 18650 5000mAh Rechargeable Protected Lithium Li-ion Battery for LED Light Headlight& Headlamp& Handheld Flashlight& Torch No memory effect, can be recharged up to 1200 times when fully or partially drained. With overcharge / discharge protection function, you can use it without worry High energy density, long life battery.Provides excellent continuous power sources to your device This 18650 battery is compatible with various kind of flashlight and LED headlamps, bike lights et Fully charge batteries before first use