So I tried out my second charger and it again is only charging to 40 volts when I plug it in…I bought one of the 42 volt balance board chargers off of Amazon and as you’ll see in the photo, it turns green and registers as fully charged…yet that is clearly not true…do these chargers have internal voltage cutoffs?? I’m lost…my BMS is wired properly and everything😐Any help would be great…
That BMS doesn’t look like one with balance charging. Do you have a link? It could be hitting over voltage on a cell group and cutting off charging. Take out the JST header and measure the voltage of each group using the leads from the header.
I’ve bypassed it on discharge. It should be balancing though…all of the balance leads are covered by tape and I just measured each cell earlier and they are all the same voltage (3.6 at the time)
I had this same problem two times because spot welding failed so bms charged one 4p group as 3p. Bms stopped charging both times at 40v. I think bms cut it there because of over voltage in broken group.
Yea, that’s why I asked you to check the voltage of every group. If a cell got loose and became a 2P or 1P group, it would get to 4.2v earlier than the rest of the groups causing and overvolt cutoff
Durp, stupid question I asked Update: so when I plugged the JST balance connector back in it start charging again…the light is back to red! The saga continues…
Also: with this new charger it only charged to 38 volts and my old 42 volt charger charged to 40 volts before it stopped. Not sure why they differed but I guess I’ll see what happens now as it started charging again!