Car wouldn't start but had not been run but twice in the past year. Changed the oil, put in gas treatment, bought a new battery, and it started. The car died again, starts sputtering, lights on the dash start going off and on flashing until the battery is dead again. The car battery will take a charge and will run until its dead. Replaced the alternator, did the same exact thing. What did I not do or what's next? Please and thank you.