It means the output energy when the cell is discharge to an end voltage at a certain discharge condition. IEC standard specifies that Ni-Cd and Ni-MH cell rating capacity indicates the output energy which the cell is charged at 0.1C for 16hrs, then discharge at 0.2C to 1.0V at temperature of 20℃±5℃. It can be described as C5.
For Li-ion battery, it defines as battery be charged at constant current (1c) under the constant voltage (4.2V) for 3 hours in the normal temperature, and then discharged at 0.2C to 2.75V, the electricity be released was define as its rating capacity. The unit of battery capacity is Ah,mAh(1Ah=1000mAh)
