if you bought the vehicle from a private seller the battery probably was dead. after you installed the new battery did you let the car run for about an hour? doing this will let the battery charge a bit from the alternator.. but that is where your problem might lie, the alternator. the alternator is what charges your car battery while your car runs, and if it is bad, the battery will not charge.. you may want to look into replacing the alternator.































hope that helped!