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Yes, the alternator charges your battery and provides all of the electricity needed for the engine and accessories like the radio. The battery is only used to provide electricity when starting the car and will keep the engine running when the alternator fails. Some cars also use the battery as a capacitor to even out the alternator output at lower rpm's. Most cars can give or receive a jump with out harm. I have never seen one hurt by jumping, but I have heard that some cars are not supposed to..?? Check the owners manual to be safe.
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