Hey all. My 2006 is going through batteries like nobody's business. I've searched the forum and the general consensus seems to be either a bad alternator or the alarm draining it. I bought this car second hand last year, and it had a new alternator and battery when I purchased it. Every once in a while it won't start. I'll take the battery up and have it tested, and it'll test as bad, so they give me a new one. (Interstate battery). ANY clue as to why this is happening? My husband has done some work on the car since he bought it (converted to a dual exhaust, brake pads/rotors, and cold air intake). He also bought a tuner. I'm at a loss here, and so is he. What could be killing the battery? (Again, I'm using a brand new Interstate battery, and the alternator was replaced shortly before I bought the car and is less than a year old.) Thanks everyone! P.S. The car is kept in the garage and we never lock the doors, so I don't think it's an alarm issue.