Features: The equalization board is not a BMS for protection board, it is an auxiliary to the for protection board, so no matter how bad the battery you use to test, it can be used, But it has no overvoltage/overdischarge for protection function. Overvoltage/overdischarge is the function of the BMS for protection board. If voltage for protection is required, it is best to use it in parallel with the BMS for protection board. Detect that the voltage difference between adjacent batteries is greater than 0.1V to trigger the start of equalization, and the adjacent battery voltage difference is less than 0.03V to stop working. (Tips: The inductance equalization board needs to be charged/discharged many times before the voltage equalization can achieve a better effect.) Inductance adjacent equalization module is suitable for battery packs with capacity below 30AH. Not recommended to be for low strings, The indicator light will flash and report an error. Before connecting the equalization board, be sure to check whether each battery is wired correctly, and do a good job of insulation. otherwise it will short-circuit and burn the board. Package Includes: 1x Battery Active Equalizer Specifications: Material:PCB Type:3S,4S, 5S, 6S, 7S, 8S,9S, 10S,11S, 12S, 13S,14S,15S, 16S,17S Net Weight:10-80g note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.