This is a new one on me.....I have had several Saabs over the years. This is 88 900 Vert. I started the car, pulled out of the garage, turned it off, just a few minutes I went to start it. Well, seems to be a dead battery, just started fine 15 minutes ago. Next step jumped it, started fine. Went to have the battery checked, test ok took a full charge. Not sure where to go next. Any suggestions are greatly appreciated. Thank You.