2001 Gtp, I think my battery is done for. the car has been sitting for 2 weeks. I tried to start it this morning and it wouldn't start, acted like the battery was dead. I used the other car to go to work, and now I'm home. I put the charger on it, it showed 100% so I tried to start it, and it wouldn't start again, put the charger back on and the battery charge showed 25%. temperature is 20ish degrees.