02-19-2009, 07:01 AM
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#3 (permalink)
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Batman Junior
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
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Any time you draw energy from a lead acid battery and then recharge it, you shorten its life compared to a battery that is always supported by an alternator. This is especially true for conventional starting batteries which aren't really designed for anything other than shallow discharge/recharge cycles (eg. starting the car).
How much you shorten its life with the engine off depends on how long you drain it down, and under what size of load.
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