Quote:
Originally Posted by Doug
what the ratings mean is that a 7amphour battery from full charge should deliver 7 amps for 1 hour, or 1 amp for 7 hours.
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Usually the A/h ratings are given for a 20hour discharge rate, ie a 20 A/h battery will supply 1amp for 20 hours but it certainly wont give 20 amps for 1hour, or 10amp for 2hours.
If you want to draw more than the 20 hour discharge rate , you have to take this derating into account.
To answer the original question, Id say you should be happy to get 3 hours. If you double the capacity , you should get a bit more than double the time from it due to the comparitive lighter loading.