Quote Originally Posted by JCO
Additional to the wood under the batteries, a thick layer of rubber will help maintain your battery charge. Any battery that is connected to the earth, whether it be sitting directly on the ground or on concrete will loose charge
The wood and rubber are no longer necessary with today's battery construction. I grew up with this rule of placing the battery on wood. A few years ago, I found out that was a waste of time. Here is a link, http://www.thebatteryterminal.com/Te...n_Concrete.htm