Can I store my battery on a concrete floor?

A hundred years ago when battery cases were made of porous materials — such as wood — storing batteries on concrete floors would accelerate their discharge. This is no longer a problem as modern battery cases, made of polypropylene or hard rubber are sealed against external leakage which causes discharge. However, the top of the battery must be kept clean and dry. Temperature stratification within large batteries could accelerate the self-discharge if the battery is sitting on a cold floor in a warm room or is installed in a submarine.