For every thing you always wanted to know about batteries, go to this site:
http://www.marine-electronics.net/te...aq/b_faq.htm#9
See #10 for the specific answer:
10. WHAT ARE SOME OF THE MYTHS ABOUT BATTERIES?
10.1. Storing a battery on a concrete floor will discharge them.
A hundred years ago when battery cases were made of porous materials, such as wood, storing batteries on concrete floors would accelerate their discharge. Modern battery cases, made of polypropylene or hard rubber, which are better sealed, so external leakage, causing discharge, is no longer a problem. However, the top of the battery must be clean and dry. Temperature stratification within large batteries could accelerate the internal leakage or self-discharge if the battery is sitting on a cold floor in a warm room or is installed in a submarine.
Hope this clears it up,
Grumpy
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