Originally Posted by WayneTaylor
FYI, always place a board under a battery when sitting on a cement floor. Moisture in the floor and battery can cause leeching of acid to occur. That can cause a real mess on the floor.
Early Car Batteries
If we take a look back at some of the earliest car batteries we will find that they were lead-acid batteries that had glass cells all encased in a wooden box. This means that if they were left on concrete or cement floors, the moisture from the floor could cause the wooden box to wrap, allowing the glass cells to shift and break.
Of course, the battery acid would leak all over the floor and the battery would be rendered useless. Not great.
As the construction of the car battery evolved into a nickel-iron battery encased in steel, and then even further with a hard rubber casing, the issue of breaking glass went away – but not the problem with discharging or “leaking”.
The rubber was porous and often contained carbon. The battery shell would take on the moisture of the floor, as with the wooden encasement, creating an electrical current between the battery cells causing them to discharge. Still not great.
Modern Day Batteries
The design of modern day batteries includes a hard plastic shell that eliminates the intake of moisture, thus making the garage floor a great place to put your car battery.
Cement and concrete floors provide a fairly good barrier between the car battery and extreme temperature changes that could otherwise cause damage to the battery cells allowing for a discharge leak.