Bake said: I agree with the use of a battery tender or maintainer. I disagree with starting the car every so often while stored - you do not get the moisture out of the engine and do more harm than good. I store my 2009 Z06 as I have done with my previous Vettes here in Wisconsin from November to April. I pump up tires to around 40 PSI put on maintainer, cover it and wait.....only good thing is it's like a new car every Spring
This is very similar to the procedure I follow as well.
I use a battery tender during the winter months, add a good fuel stabilizer to the tank, increase the tire pressure (I even go one step further and remove my nice wheels and tires then reinstall the stock set of wheels I have for winter storage), apply leather conditioner to the seats, cover car, and do not start it until summer.
You must use a battery maintainer during the winter, even if you remove the battery from the car. It will vastly prolong the life of the battery.