Posted by LJD on November 27, 2011 at 15:50:26 from (67.142.130.38):
In Reply to: OT Battery trouble posted by ken52m on November 27, 2011 at 15:36:06:
There are many newer cars that will kill a battery in 6 weeks if they aren't started. NOT a couple of days though. And 10 MAs is nothing. The fact that you've let some sit for 8 months doesn't mean a thing though. Different cars with different options have different current draw demands when parked. My 98 Dodge Caravan will kill a battery in 6 weeks like clockwork if I don't keep a battery maintainer on it OR turn the battery off. It says that right in the owner's manual. My 99 Kia Sportage about the same. On the other hand, my 2002 Subaru can sit much longer.
Besides whatever drain your ECM and/or alarm draws all the time - a battery also discharges all on it's own.
A standard lead-acid battery loses 2%-30% of it's charge every month when not hooked to anything. The more antimony in the plates, the faster it loses its charge. So, the more HD the battery is, the faster it loses it's own charge.
Most standard-equipment car batteries lose 5% per month.
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