I have a 10s2p battery pack made out of 30q cells that has been running great. Recently I was unable to get the board to power on and I checked the voltage with each cell at 4.0v - I only got 36v across the pack. I replaced the two dead cells and now get 40v across the pack (nice).
The issue here is when trying to get output from the pack, If I read across the pack from positive to negative (direct connection not via BMS) I will get 40v, If I read the output from the BMS I will get nothing.
Just reading from Positive BMS to pack I can get 40v but BMS negative to pack will give 0v - It starts at around 2/3v and then slowly drops to 0v…? Strange.
Im a little out of my depth here in figuring out whats going on, possibility is to replace the BMS but I need to know if its actually dead or not. No BMS wiring has been changed since it was working.
I can answer any other questions you have or if you need images, any help would be greatly appreciated I miss commuting on the board so much
Kind regards, Harry