Do Car Batteries Drain On Concrete. When a battery is sitting, it is slowly draining. Contrary to very popular belief (even touted by many a mechanic), today's car batteries with their hard plastic shells will not discharge or otherwise be damaged when placed on a concrete floor. The real reason a battery dies is from sitting.
I was an electrician in the navy. The real reason a battery dies is from sitting. And because of the porosity of that material, battery acid would sometimes seep through the rubber and create a conductive path through the damp concrete, draining the battery.
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A battery can be drained whether it is sitting on concrete, wood, metal or any other surface. In the video we're looking at whether placing a car battery on concrete actually is bad for the battery. It is a well established fact that car batteries stored on concrete go dead quickly. When the batteries do discharge faster than you expect, it is very unlikely that the material it is stored upon has a major role to play.