This board is based on the principle of adjacent equalization and cannot be used as a maintenance tool. To 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 achieve energy transfer and balance. Inductive energy transfer balance board, high current 1.2A energy transfer battery voltage balancer, significantly balance the battery voltage and the overall efficiency of the battery pack! This module is the adjacent voltage difference equalization,the adjacent battery voltage difference reaches more than 0.1V,the chip internal triggers the equalization work,until the adjacent battery voltage difference is within 0.03V and stops working,when it is used on the battery pack,there is adjacent voltage difference when charging and discharging Triggering the equalization work,the battery pack voltage error will also be pulled back to an perfect value,reducing battery maintenance costs. Working voltage: 2.0V-4.5V Universal ternary iron lithium battery LTO battery is not applicable! ! ! Balance Instructions 1. When the equalization light is on, the equalization work is turned on 2. The equalization light is off, and the equalization circuit is in state 3. The equalization light flashes, indicating is dropped, or the circuit is faulty. Balance current 1,The adjacent voltage difference is more than 0.1V (the current is about 0.5-0.7A) 2,Adjacent voltage difference is more than 0.2V (maximum equilibrium current is 1.2A) 3,The smaller the voltage difference, the smaller the equalizing current. Colour:As shown Material:PC+Metal Package Contents: 1 x 4S Balancer Board Only the above package content, other products are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.