Bundle: Olight 2600mAh Protected 18650 Rechargeable Li-ion Batteries Design for S2 S2 Copper S30 Flashlight with Olight Patch,Set of 1 Olight rechargeable 18650 battery,circuit protected. 2mm longer than normal battery. High performance High Capacity 2600mAh 18650 Rechargeable Battery Built-in Protective Circuit - Overcharge Undercharge Over Discharge Protection Superior Cycle Life Performance - Recharge 500 Cycles Without Deteriorating Performance Package : Include 1 x Olight 2600mAh 18650 Rechargeable Battery and Olight Patch