As cells self discharge due to internal resistance and internal resistance increases with time/use and that self discharge to 0V harms nimh, then I'm afraid storing with no charge is the worst thing you coulds have done.
Low rate charge cycling is your only hope BUT IT IS ESSENTIAL TO EQUALISE THEM. In fact turn the discharger off early so no cell finishes and goes dead flat before the others.
Any individual cells venting are on their way, consider binning those and re-soldering only good cells?
__________________
Nortech is ACE!
|