This board 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. Inductive working principle: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. Wiring Definition: B-: The negative pole of the battery pack (the negative pole of the first battery) B1: pole of the first battery : pole of the second battery B3: pole of the third battery B4: pole of the fourth battery B. . . . . . N+ and so on Technical Parameter: 1. Working voltage: 2.0V-4.5V 2. Universal ternary iron lithium battery 3. 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 sleep state 3. The equalization light flashes, indicating that 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:black Material:PCB Batch size , the on the module may be screen printed differently, it does not affect Package Contents: 1 x Active Equalizer Balancer 1 x Cable (random colors, ' accept the specified color) Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.