Chuck wrote: >I'm not understanding why a warmer (Pb-acid) battery takes more >current to produce a given voltage under charge than a cooler >battery. Seems that lead-acid batteries are supposed to be more >efficient (less internal resistance) when warm than cold. So I >would expect the opposite of what occurs. Any explanation?
No, this is exactly what you would expect. The warm battery has less resistance and is charging more efficiently. If you put one amp for one hour in a battery then you can get an amp hour out. If you have to put it into a cold battery at 2.4vpc your still only gonna get it out of that battery at 2.0vpc. If you put that charge into the battery when it was warm you may have been able to get it in at 2.3vpc - thats more efficient. Neon
