Stanton
Well-known member
I have done this (replaced modules in a pack), so a couple of comments.MikeinPA said:xa, what a great idea. I am finally replacing some modules in a 2013 pack, and have been pondering how to get all the old cells as close as possible without taking them all up to 4.10 volts. Your technique is perfect--I will take all the cells down to 3.70, then let it balance for a while. The new modules will have greater capacity, so I will need to raise the voltage on those after using your technique.
- It's not so much what you charge the pack to, but what you (manually) charge the replacement module(s) to. It's much easier to charge everything to "full"; after all, you aren't going to leave it there long and (trust me) it's difficult to get all the cells within the replacement module even/equal.
- Worst case, charge the replacement module(s) a bit above the pack, because it's better to have your charge stop early (in my case I have one really good cell that I didn't balance well) than get a surprise at the bottom of your pack (which is what happens with "weak" modules).