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the alternator may be bad. you would have to get the charging system checked. a volt meter would be handy to check if it is charging. i would say a draw but 5 minutes is real fast to drain a battery. bring the battery back where you bought it and it should be warrantied. that or charge yours to a full charge. once you have a fully charged battery, bring the car to a shop to check the alternator. make sure your terminal ends are tight!
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