Wal-mart has a battery for the wing if you need it in a hurry. I forget the brand name, good price though. I replaced the battery in my '03 with an Interstate battery ... a friend who works at a garage got it for me at mechanics cost.
Mine was dead after sitting unused all of December and January. I just put a charger on it for a few hours and have been riding it to work on and off since the first of Feb. It's the original battery from '02.