Standard charge and discharge current 0.5C AC-impedance smaller than 0.4m  At a fresh state Weight 4.2 kg Maximum Charge Current 1 C(Continuous) Charging End Voltage 3.65V Maximum Discharge Current 1C(Continuous) 2C(120 seconds duration maximum followed by a 'zero current rest period' of the same duration) Discharge End Voltage 2.5V Discharge End Voltage 2.0V