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Old 08-15-2009, 01:09 AM   #11
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 45,071
 

2003 L-Series 3.0L Sedan
Default Re: My battery is dead overnight

Use a battery charger overnight if possible, with a low current below 5 amps. Using a charger putting out more than 5 amps can cook one. Measure voltage with a separate multimeter, not with whatever's on the car. Only a separate voltmeter is accurate and the small digital multimeters are worth their weight in gold when working on anything requiring electrical measurements. A good battery will hold its voltage above 12.5v but if below that may be an indication of a dead one. That's why the first question about batteries is the age of one. The average battery life is around 5yrs, maybe more in warm climates, less in desert heat. We're not talking about Optima's or any exotic ones, just the average battery everyone buys and uses for everyday use year in and year out.
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