Originally Posted by onegreenev
The closer to fully charged they are the less amps will be going into them. So you hit the constant voltage. Hobby charger? Which one? Not all Hobby Chargers can do super high current on a large capacity cell. Charge them up then run them down then charge them up again. But run them in your bike. Be sure they are all charged equally. Bottom balance them then charge them connected to your bike. You may want to check the capacity. They look like my CALB 100ah cells. Good quality cells. Does your bike have a proper charger for these batteries?
I'm charging with this:
It's a good CC/CV charger with 20A charge current capability, and CV mode starts at 3.6v.
The prior owner accidentally left his bike on, and it self discharged to the point that two of the 12 cells died - which saved the other 10. He was using a bulk series charger, which obviously over-volt the remaining ten cells if I attempted to use it.
Thus, the hobby charger is being used. I wired in parallel to top balance them. I have no interest in bottom balancing because the charger I eventually plan to use will always ensure each is individually charged to the correct voltage, so there's no risk of over-charge from varying capacity or IR. I'd just have to watch it on the low-end while in use for a weak cell. I'd do at least 1 test of each at full discharge to establish what kind of capacity I'm working with to see if there's a dud or two in there.
I mainly made this post because I'm perplexed that it can only be receiving 11-12A charge rate on a 500 AH bank, then immediately fall back to the 3.35v range. Do these cells not actually rest at their peak charge voltage?