You may want to check this out.
"Safety Charge Mode > In the event that one or more cells within a battery pack are damaged, the charger will automatically invoke Safety Charge mode. This could occur if the total pack voltage is low (the battery has been drained too low), or if one or more cells are below a safe operating voltage. The charger is capable of rejuvinating most of these battery packs safely and automatically."
FMA Direct is well known in the flying world for quality. That said, its a real bang for buck chager given its abilities.