Tangsfire 18650 3600mah 3.7v Rechargeable Li-ion Battery (Pair) + Charger Combo& Free battery box Pack of 2 2800mAh 18650 Li-ion rechargeable batteries and universal battery charger With overcharge / discharge protection function that you can use this battery pack without worry 18650 button top battery is compatible with various kind of flashlight and LED headlamps, bike lights et High quality and durable. High energy density, long life 18650 battery and charger Not for the devcies match the Flat Top 18650 battery like Reuleux RX 200 and so on.