by Burgerman » 10 Jun 2018, 17:54
How many cells does your 13S pack have?
Is it 6 parallel?
If so you have have a bad cell in group 13. Not the 13th cell. ANY cell in group 13.
You will only find out by fully charging group 13, and seeing if it then behaves properly. After storing a week.
So charge that one GROUP of cells seperately, as its only at 3.2 something volts (almost discharged). Or with 300mA balance you will be waiting weeks for the hyperion to do it. Charge group 13 as A large single cell. And THEN balance by charging on the hyperion as a full battery. Only then test it. If faulty, then you need to test each celll in group 13.
If any single cell, in group 13 is bad it pulls all the rest down. Is this the pack that you rebuilt after someone else built it badly? Its possible that many cells are faulty due to being too low, or other issues.
You have to start with all groups full. If any single cell group is full, and the rest or just 1 Group is low, you may have say 72Ah to balance. At 300mA, That would take 230 hours. Or about 10 days...