Not all chargers can give you the internal resistance of each cell. You have to have a fairly significant charger to obtain this information. That said, I do have a Hyperion charger that constantly charges 2 x 5s packs at 2C from 2 12 volt deep cycle batteries in series for 24 volts. Thankfully I have never had an incident. I am wondering though, some of you are saying if the IR is too high you could have a potentially bad pack. What would the internal resistance be to know that your pack is unsafe?

Thanks