[18650 Battery] SPERAS RC26 is 18650 lithium battery, 2600mAh with premium battery cell. [High Protection] Built in advanced protection board, prevents overcharge, over-discharge and over-discharge current, which provide a safe usage. [USB-C Port] The USB-C port on the battery, allows to connect 5V/1A or 5V/2A adapter to charge the battery convenient without seeking a charger. [Wide application] 3.7 Volt rechargeable battery compatible for high power devices, such as headlamp, flashlight, radio, cameras, doorbells, LED lights, solar lights, toys, small fans, RC car, headlights, etc.