RE: How to charge NiMH batteries
What's interesting to me in the powersonic data sheet is that maximum cycle life is obtained by slow charging. It should be noted however this is based on a discharge to 1V and a .1C charge for 12 hours only, which is inconsistent with their charging method of .1C for 15 hours. (that's the cycle life graph I'd like to see).Based on their charging characteristics,12 hrswould stop the charging at pretty much exactly when the battery achieves full charge, and very little if any overcharging occurs. I think my mistake in the past was to not discharge the battery and just charge it at .1C for 15 hours which overcharges the cells every time. Like sanyo, they state that repeated overcharging can deteriorate performance.