Thread: Battery drain
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      04-13-2009, 10:37 AM   #10
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Drives: 07 AW Z4C 3.0Si
Join Date: Aug 2007
Location: San Diego

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Had a similar problem. Installed new battery to replace the oe 6 year old one. Worked great for 3 months as a daily driver. Went on a 4 day trip and battery was dead on return: jumped...charged....everything OK. Car would start fine if I drove the following morning, let it sit for more then a day, battery dead. Clean contacts again, check charging system, check for shorts.....everything OK. Load test on battery was erratic, seemed like it would read fine one time and low voltage another: conclusion was a short within the battery. Replaced the battery and problem solved.
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