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Old 06-09-2016, 10:51 AM   #2
911monty
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Join Date: Oct 2014
Location: California Central Coast
Posts: 1,476
Garage
Well in general; no it is not normal for battery to be low after a drive, with a working alternator battery should be pretty well charged after about 20 minutes of freeway type driving.

I don't know your battery but the math works like this, 600 CCA battery will take 15hrs to fully charge at the ~ 4amp charge rate your charger has. That's why yours took till 8am.

I'd say you have a bad alternator. A chain auto parts store will usually check for free. Hope this helps.
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