Battery brand and type : LiitokalaBattery : Lii-51S 26650Diameter : 26.5mmHeight : 67mmSustainable Current : 20ALife cycle : 1000Battery capacity : 5100mAhStandard voltage : 3.6V-3.75VFull charging voltage : 4.2VNoteDo not short-circuit the battery. Please do not short-circuit the battery, do not overcharge the battery and over discharge.