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 a lithium battery protection board. Inductive Working Principle: This module is for adjacent voltage difference equalization. When the adjacent battery voltage difference exceeds 0.1V, the chip's internal equalization work is triggered until the adjacent battery voltage difference is within 0.03V and stops working. When used on a battery pack, adjacent voltage differences during charging and discharging will trigger equalization work, and the battery pack's voltage error will be reduced to a perfect value, lowering battery maintenance costs. Cable Definition: B-: Battery pack negative (negative of the first battery) B1: First battery B2: Second battery B3: Third battery B4: Fourth battery B... N+ and so on Technical Parameter: 1. Working Voltage: 2.0V-4.5V 2. Universal ternary lithium iron battery 3. LTO batteries are not applicable Balancing Instructions: 1. When the balancing light is on, the balancing work is active. 2. When the balancing light is off, the balancing circuit is in standby mode. 3. When the balancing light flashes, it indicates that the connection is lost or the circuit is faulty. Balancing Current: 1. Adjacent voltage difference is more than 0.1V (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 balancing current. Color: Black Material: PCB Batch size, on the module, may be screen printed differently, which does not affect its function. Package Contents: 1 x Active Equalization Balancer 1 x Cable (random colors, 't accept the specified color) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a slightly different from the real one. The allowed measurement error is +/- 1-3cm.