Conduct 500 cycle tests on the samples in the following order:
a) Under voltage discharge;
b) After the protective device acts, stand for 1min.
Under voltage discharge, the discharge current is the standard discharge current (LDR)
The undervoltage discharge protection circuit of the battery pack shall act during each cycle. The minimum voltage shall not be lower than the smaller of N times of the battery discharge cut-off voltage or the discharge cut-off voltage of other groups.