Review on 🔋 ZRM&E 1-Pack 4S 14.8V 18650 Li-ion Lithium Battery Charger Protection Board 16.8V Overcharge Protection 10A BMS PCB Circuit Electronic Module by Janet Rivera

As another reviewer wrote, I had to plug in the charger before this BMS would power the P+ and P-. After I plug everything in, the P+ and P- tabs do nothing at all. I plugged in the charger connected in parallel to the P+ and P- BMS pins and after a few minutes unplugged it and it worked. Then a few hours later the BMS turned itself off again. I charged it for a few more minutes and it's been working fine ever since. There were absolutely no instructions or schematics for this little thing. I had to do a little reading on the internet. Most online sources advise you to connect the cables to the battery first and then to the BMS. But this little BMS didn't have such a connector for the wires, so I first connected the wires to the battery cells and then soldered them to the BMS one by one. It looks like I got it right because everything works and the voltages are read correctly.