hello I have a 1998 ml 320 benz..I recently had my starter replaced..the battery on it is 3 months old.. my vehicle sat in my driveway for 2 weeks before I had my starter replaced. the day I had my starter replaced we noticed the battery was dead so we jumped it had the starter replaced and it was fine for about 4 days then I went to start my car and the battery was dead again..I had it jumped again it was fine but my music system would not come on ..radio, screens ect.. it was working right before I had jumped it..now I have this weird egg odor on the inside of my car..what do u think could possibly be wrong?

Optional Information:
1998 Mercedes-Benz ml 320 v6

Already Tried:
jump started it..going to get battery tested and altenator