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I would start with the battery (unless its new), I would pull the battery, leave it at autozone so they can charge it up, then have them test the battery with a load (if you can charge it almost any mechanic should have a load tester).
If you can jump it and run it for several days without problems, I would say your alternator is probably good, but autozone can test that for you too, free test, you just have to take them off. Or if you have a volt meter you can test your alternator yourself, just test from battery cable to battery cable, a working altenator will have 13+ volts (with the car running of course).
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