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Hard to say, maybe nothing. If the battery is completely dead, say if lights were left on all night, you can try making SURE the jumper cables are making good contact, leaving cables hooked up and letting the car giving the jump run for a while (20-30 min), and having someone rev the motor of the car giving the jump when trying to start the dead car.
Also check to make sure the battery cables are hooked up good, nice and tight. If OXIDATION has built up on the inside of the car's battery cable ends or on the battery posts this can prevent the battery from grounding or power from flowing from the battery. You'd need to clean off the oxidation with a wire brush/sandpaper, or scrape it off with a pocket knife.
You could take the battery out, and take it to a garage and try to have it charged overnight. If it works after that but then goes dead again in a day or two its probably got a dead cell, no good any more.
You could take the battery to Advance Auto Parts or a Wal Mart with an auto department, they can check it for free to see if it has a dead cell.
If the battery is good, but still does not charge in the car, then you may have a bad voltage regulator or alternator.
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