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Here's a copy/paste (from Overboost :-X): Reserve Capacity:
While the CCA value is used mainly to judge a battery's peak output and ability to start your engine on a cold winter day, reserve capacity tells us how long you can expect a battery to run your headlights and radio while the engine is off. Larger reserve capacities will also run your engine longer if the alternator dies. Just as the cold cranking amp value is given in a worst-case scenario of extreme cold, reserve capacity is a time in minutes that a battery can sustain a constant 25-amp draw until the voltage drops to 10.5 volts at 80 degrees Fahrenheit. The SAE gives us an example of driving at night (headlights on) with the defroster and windshield wipers turned on. Our Honda battery lists a reserve capacity of 70 minutes, giving us approximately one hour of severe road driving conditions.
[ http://www.overboost.com/story.asp?id=311 ]
wannabe genic sig:
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