I have had a 2005 Cobalt for 3 years now without trouble. 2 months ago, wife rear ended someone and the hood is now messed up a little, still very drivable. Last week the battery died, so went and got a new one, put it in and all seemed OK. Well, it died again. The battery light did not come on, leading me to believe that the alternator is OK. Jumped it and it started and ran fine. Tried to start it later and no go. Any ideas?