I have a 2002 PT Cruiser. Last week, my two year old battery died while sitting out in my work's parking lot. I didn't leave any lights on or anything. I tried jump starting, but it wouldn't budge. I ended up buying a brand new battery and it worked for a total of 3.5 days. My car is now dead again and won't jump start. I have no idea what the cause of this could be. All interior lights and functions still come on, but car won't start. Any help?