2005 gx. It sat for about 3 weeks. Went to start and the battery was dead. I jumped it drove it home. I removed the battery had it tested and it was fine. I charged the battery with my battery charger. I drove it for a week. I went on vacation for two weeks and I tried to start it. It started fine. Out of curiosity I threw the charger on it again and the battery was at 30%. Would this be a bad alternator? My buddy had an Avalon and he said it had the same symptoms. He had the alternator tested and it was fine. But he replaced it anyways and it fixed the issue. I’m hoping it’s the alternator and not a bad ground somewhere. There is not an aftermarket stereo in it so I doubt it’s a bad ground.