Hyperion 0610i Charger power supply

[BrianG]

If the NiMH cells are too hot after charge, reduce the delta peak value. It is most likely too high in auto mode. Change over to manual mode and set the peak value to something like 5mv/cell as a start. The cells should be warm, but not hot at the end. Excessive heat is not good for NiMHs.

BTW: whatever mAh you put in once the cells start getting hot is going to heat, not the charge. So, if your GP3300 cells take 3100mAh, and get really hot at the end of say 3500mAh, you aren't actually putting in the full 3500, more like 3200-3300.

Since batteries do not have a linear discharge curve where the voltage linearly follows the charge level, you cannot tell from voltage alone. You could get a very rough idea by just the voltage, but that's it.