If you need to revive them, that seems to imply that they are currently dead? You are talking about breaking the string down into 6 cell groups and charging each group by itself - but to what end? If they are going to go back into the vehicle, that would be a very strange approach. If you are going to be using the battery bank at their 6s nominal voltage, why not rewire them all into a parallel arrangement and do them all at once? And why exactly would you want a 14.4v nominal battery (if Brian is correct about the cell voltages; and I am going to just assume that he is).How to revive them.
Duly noted thank you. I used a charger that has a lithium setting. For 12volt car/ boat baths. As a trial run. I removed 5 s cells after considering 6s. So an 11v-12v module @ 2.2v- 2.4v per cell. This may be wrong, as the system seems to be built on a 6s format. However the staggered effect when reintroduced with overlap may help balance out cell voltage overall? My goal for now is to achieve 9volts retained, each 5 cell s module. Then connect as original , same format, and charge the entire pack.
This shows the voltage across a set of ten cells in series, with essentially zero voltage. These should be at 24 volts nominal, so if the typical operating range is 1.8 to 2.85 V/cell then ten should run something like 18 to 29 volts depending on state of charge. There is presumably at least one completely failed (open circuit) cell in there somewhere. A discharged but okay cell is at about 1.8 volts; near zero voltage means dead, not just discharged.
Good cells can be charged in parallel, and most EVs have two or three cells in parallel... but if one is bad, it's not a good idea. I would want to get them sorted out before parallel charging anything.What do you think about charging in parallel if they don't balance in series?