18650, Li-Ion, Lithium Ion, 2000mah, Laptop Battery, 7.2v, Lithium Battery, Polymer Li-Ion, Battery, Lifepo4, Ni-Cd, NameCylindrical lithium ion batteryModel18650Dimensions18 x 65mmVoltage3 ... to +45 degree centigrade - Discharge: -20 to +60 degree centigrade - Charge Retention/Storage [%]: 1 year at -20 to +25 degree centigrade ...