Do you realize how much a person could of made marketing a battery board
.A charged battery in a garage on the floor is not a problem.When we store boats for the winter in cold storage we leave them in the boat,just unhook a cable.
A clean battery wont have any trouble.
When I did Exide battery warranty's I would have to show the Farmers how a dirty battery loses charge across the top...Just like Mastevt said........You get a voltage draw across the top then you could take your fingerrun it across the top and WALA no draw......