I suspect that C is "charge rate", but I'm not sure how that interacts with battery lifetime. http://en.wikipedia.org/wiki/Battery_charger#Charge_rate http://en

I suspect that C is "charge rate", but I'm not sure how that interacts with battery lifetime. http://en.wikipedia.org/wiki/Battery_charger#Charge_rate http://en.wikipedia.org/wiki/Battery_charger#Charge_rate