12V 100A 4Series BMS Protection Board with Balancing for 18650 Li-ion LiFePO4 Battery Pack

バッテリー（－）端子をB-に接続し 本器のOut端子とバッテリー１3.23V（＋）との電圧が2.8Vしかでません。 2台購入しましたが。2台とも同じ現象で使えません。100Aと記載されていますが。疑問です。

it works though i have not used the full 100 amp current but they keep working at at least 40 amp. The bms actually is still usable while charging as well. I have bought 2 of these and only one failed at the charging port side for some odd reason it would not charge anymore got it exchanged and everything has been fine sense and its been well over 30 days of charge cycles with my solar set up. Now that some one is getting a bit greedy with the price ill have to look for another seller that is cheaper with the same product.

لاتعمل

I tested this on my bench power supply. Current limit set to 10 mA, then slowly increased the voltage until clamping occurred. 3.58v was the cutoff for each cell "channel." It was surprising that it was exactly the same across each channel. Make sure 3.58v per cell is acceptable for your battery pack. The balancer does a weird pulsing thing. It pulls a small amount of current for a second, then stops and allows the voltage to go open circuit, then repeats. I'm not sure why this happens, or if it's by design, but it's something interesting to note. I did not test the main power disconnect side of the balancer. It appears fairly robust with a number of MOSFETs. The 100 amp rated connections are solder points on the opposite side of the board.

todo bien