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Old 02-15-2010, 12:21 PM   #3
mikefocke
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Join Date: Aug 2005
Location: Sanford NC
Posts: 2,591
The maintainers

Generally operate to charge within a narrow voltage range and thus a fully discharged battery is below the voltage at which the maintainer will kick in.

Jump start the car and go for a 45 minute drive with accessories off. Then bring it back and put the battery on a maintainer for 24 hours. Then remove from the maintainer for 24 hours and place a load tester on the battery at as close to 70 degrees as you can get. The result will tell if your battery is good.
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