Hi I have a 12s4p 21700 P42A pack. I rode ~50 km range the last Friday. My battery draind down to 36.7 volts (3.06v/cell) acording to Focbox UI. Today when I ride the board I got shitty range
My BMS is due to be replaced as son i recive My new one eventually. It is wired to Charge only. I don’t know a lot about batteries and wonder what can be at wrong.
Before I started my ride today I charged it full 50.0v acording to Focbox UI app.
My charger is a YzPower 12s(50.4v) 6A charger.
Never had this problem before. I have like 20-30 charges only on this battery never had the battery below 40v before the last ride.
Any ideas?
Edit I have checked before that my battery is att 50.4 volt with a multimeter. And my charger charges att 50.4v.
Let it charge more? I noticed mine drops like 1v after charging, then it does one more small round of charging and it stays at 50.4v after that, then it is really charged.
Also make sure all cells are balanced
if one p group is lower than the others, that means something is wrong about it, if the pack if low cycles it can be replaced
Kepp the battery plugged in to the charger for longer, considering bms is only probably 50ma balance, and you have a 16ah battery it takes some time to balance out hopefully
Just remove it from the pack, and use the battery as 11s if you must, you should still be able to charge it with a 12s charger safely as bms will cutoff at 4.2v anyways.
I guess a new p group shuld fix the problem and stay in balance with the rest of the pack.
Weird that only one group died though, a few days ago i eptied my 12s4p 40t pack to 2.6v per cell and it charged right back up…
Yeah until I get the new cells can I use the board as is? Or should I remove the dead p group right away. I don’t have a 11s charger can I use my 12s to charge my to be 11s battery.?