I received a new 5000 mAh 3S battery recently that one cell was consistently .3V lower then the rest. I tried balancing with the charger a few times and the charger wouldn't bring up that one cell. So I set the charger to 1S and charged at 1.2 Ah through the balance port. This worked like a charm.
After this I've run the battery down a few times and charged the battery back up while balancing and now I get consistent balanced cells. It appears that at least with my charger if the cells are two far out of range it's not able to balance correctly. So if you have cells that won't balance you might try manually charging each individual cell.
After this I've run the battery down a few times and charged the battery back up while balancing and now I get consistent balanced cells. It appears that at least with my charger if the cells are two far out of range it's not able to balance correctly. So if you have cells that won't balance you might try manually charging each individual cell.