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Sure, if the alternator voltage regulator is defective it can overcharge the battery.

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12y ago
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Q: Can a car battery over charge it self in the car?
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How do you make a self powered car?

You could try and hook up a bicycle workout machine to a battery so when you work out in the morning, you charge the battery. Then put the battery in an electric car.


Can a drained CAR battery recharge over night?

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