This device is completed with a lithium-ion polymer 3.6V 65Ah, and this battery is mainly used in energy storage and EV. Its maximum charging current is 21.6A and the maximum discharge current is 32.5A. the battery may experience this voltage on an infrequent basis, when the battery`s voltage reaches this linit, the charging power shall be reduced to zero. Unless otherwise specified, “Reference charge” shall consist of charging at constant current of 21.6V, to 4.05V and 13.0V to 4.2V. the charging current is tapering after cell voltage getting 4.2V to 3.25V. for test purposes, charging shall be performed at 25±2℃.