This card is based on the principle of adjacent equalization and cannot be used as a maintenance tool. To connect to the battery, it must be used with the lithium battery protection board. The pressure difference generated by charging and discharging triggers the work of the equalization board to realize energy transfer and balance. Inductive energy transfer balance board, voltage balancer of 1.2A high current power transfer battery, significantly balances the battery voltage and improves the overall use efficiency of the battery! This module is the equalization of the difference of adjacent voltage, the adjacent battery voltage difference reaches more than 0.1V, the internal chip triggers the equalization work, until the adjacent battery voltage difference is less than 0.03V and stops working, when used on the battery, there is adjacent voltage difference when charging and discharging By triggering the equalization work, the battery voltage error will also be reduced to a perfect value, thereby reducing battery maintenance costs. Operating voltage: 2.0V-4.5V Universal ternary lithium iron battery