Panasonic UR18650ZY 3.7V 2600mAh Li-ion Rechargeable BatteryMin Capacity: 2450 mAhTypical Capacity: 2600 mAhNominal Voltage: 3.7VCharging: CCCV, Std. 1750mA, 4.20VCharging Time: 3hrsAmbient TemperatureCharge: 0+45CDischarge: -20+60CStorage: -20+50CCell Dimension (Max.): 18.6 x 65mm (D x H)Weight(Max.): 48g