Known issue for Ni-Mh battery:
it is useful to create a specific charging profile for each problematic battery.
Example
1] Charging current not greater than C/2
2] Maximum capacity with a margin of +10% or 20%
3] Cut Off timer calculated on maximum capacity with margin
4] -Delta V at least -4mV but never zero mV
it is useful to create a specific charging profile for each problematic battery.
Example
1] Charging current not greater than C/2
2] Maximum capacity with a margin of +10% or 20%
3] Cut Off timer calculated on maximum capacity with margin
4] -Delta V at least -4mV but never zero mV