I never use any gas stabilizer - never had a problem... yet my garage is heated. I use a good ($35) trickle charger that switches to pulse mode and has never damaged a battery. The pulse mode keeps the sufates from building up on the plates. When you say put it up for the winter I had to laugh for mine is truly "up" for the winter... its on my 4 post lift 5.5' in the air with my GN under it...