Hello, is it safe to store a car battery indoors like a basement? I know a battery gives off toxic/flammable fumes while being charged but does it give off anything while just sitting disconnected. I took the battery out of my classic car for the winter and am thinking it would be better indoors rather then out in the cold but i want to make sure it will be safe to store indoors first. My son plays down in the basement and i don't want him inhaling stuff he shouldn't or I don't want to worry about the battery being in the same room as the furnace. thanks for the help.