I store my 20 yr old MB convertible during the summer months here in SW FL. Last year I stored it at an indoor storage facility. They said they would plug in my battery tender. It's a big metal barn with open doors on one end. They didn't use the battery tender and the car was so dead it could not be jumped. I also heard that the car was near the door and was filthy from the guy who cleans them up. Not paying $110 a month for that kind of service. This summer a neighbor behind me is letting me park under his covered patio. I will run an extension cord over for the battery tender and cover the car and tie it down as best I can. It's hard to keep a cover on a car on the coast of FL. Does anyone (in FL) have any suggestions as to what else I should do? Should I crack the windows under the cover? Put moisture control packs in car?