Why would anyone put these things in BMS, I don't understand! Please do yourself a favor and don't buy them, and if you do, throw them in the trash! After reading the reviews I realized I wasn't the only one who felt these things didn't work. I assembled a fairly simple 3S 4P battery pack and connected the so-called BMS board according to the instructions. First of all the diagram shows P+ and P- at the end of the board labeled Input/Output which has a 0V output but allows charging but stops at 12.6V and not even 12.7V, and I was afraid to let this go on and neither should you.
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