- This topic has 3 replies, 3 voices, and was last updated 10 years, 10 months ago by
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I think 10mA is still normal. If you let your car sit for a month it will only drain 7,2Ah from your battery, so your car should still start normally.
A typical battery will put out 60 amp-hours, that’s 60 amps for an hour or 60 milliamps for a thousand hours, which is like 45 days.
If your battery is going dead after a day or two of 20 milliamps of drain, it’s in really bad shape. Two days at 20 milliamps is 1 amp hour, 1/60th of the typical battery capacity. So the battery is bad, or the alternator hasn’t been charging it very well. The simplest test is to charge the battery fully, overnight, with like a 6-amp charger. Then in the morning turn on the headlights and high beams. That’s about a 20 amp draw. A 60-amp battery should handle that for 3 hours. But don’t drain it that far. If it starts sagging into yellow headlights within 20 minutes, the battery is really bad.
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