What is the (charging and discharging) rate of battery?

The （charging and discharging）rate of battery is refer to required current value when battery in a specified time to release its rated capacity .It is equal to a multiple of the rated capacity of the battery at the data value,usually indicated by the letter C.For example ,The nominal rated capacity of battery 600mAh is 1C (rate),300mAh is 0.5C, 6000mAh is 10C .