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well, the answer is a bit complicated. First off, it's VERY possible for a battery to run the radio, dome light, even the headlights, and not be able to start the car.
It's also very easy to mess up the jumper connections so that the battery isn't getting enough kick from the donor car to start the car. The negative cable needs to be on a good ground, and sometimes, especially in older cars that have rust and tar and other crap all over 'em, good grounds can be hard to find.
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