I'm pretty new to this and don't know to much about cars but i have a 2003 Chevy Impala with a brand new Battery in it. The other day i went to get coffee and i came out and the car was dead. I jumped it and it started up and was good. Then tonight i was out and when i got back to my car not even 20 minutes later it was dead again. I jumped it and it started up and was good for the rest of the night. Any one know what might be wrong ?