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You either have a bad battery or something is draining it. A good way to test for this is to remove the pos battery cable from the battery. touch the cable to the battery post to complete the connection. If you hear something pop on, hum, buzz or click, it is staying on draining the battery. Your local auto zone, or advance auto ect will test your battery for free
You need to do a parasitic load test.(this will require a DC ammeter).I prefer to test with a clamp-on type meter for a faster draining condition like this.Most people don't have this kind of test equipment,so the only other way is to just look for things staying on.A battery draining in 24 hrs is probably a 1-2 amp load.Try looking at the trunk light(gotta start somewhere).I have found glove box lights,vanity mirror lights,and underhood light staying on before.(I even remember a Chevy Blazer that had a 16 amp drain because the rear wiper motor wasn't parking correctly!)If there isn't anything obvious,then pull one fuse at a time until the battery drain stops(start with things you can drive the car without).