I have two exact batteries that i use in series . Both are the same model, 5s1p 5000 mAh batteries.
This is the first time i have to charge them after a full discharge, wich never reached less than 3.2v.
One of them seems to charge correctly.
But the other one doesn’t charge more than this
A : Does this mean that the battery is damaged?
B : Another important question, before charging them after long usage, the charger tells me they are 4 s , but after some charge it detects again 5 s, is this something i should worry about?
C : When i conect the VESC to the batteries there is a small spark (im using xt60 conectors) should i worry about this ?