[tightwad]

Sounds like your battery is bad(probably from the cold/sitting) And your alternator is either not strong enough to run the car, or is also bad. Your alternator could have gone bad from running your car with a bad battery. This overworks the alternator. I would start with a new battery, then have the charging system checked.

You can tell the age of the battery by looking at the date code on the side(generally). A3 would be Jan/2003 etc.