Claim: Storing a car battery on a concrete floor will drain the battery and ruin it.
Example: [Collected on the Internet, May 2002]
Apparently, he is under the impression that putting a car battery on a concrete floor would drain it! Not only that, but that the battery would not "take a charge" after this occurred.
Origins: Much of what makes a car go remains an arcane mystery to the average person. Automobiles are large and complex, and as any car owner quickly discovers, malfunction of even the smallest and most seemingly unimportant automotive part can be all that it takes to render them inoperative.
Tidbits of whispered wisdom therefore prove popular among the less than automotively inclined, who look to keep their vehicles running even if they're not quite sure exactly how to go about that.
One bit of whispered wisdom dictates that a car's battery must never be stored on a concrete or cement floor. The reasons given for this prohibition vary depending on whom one hears the admonition from. Acid leaking from the battery will ruin the floor, say some. Or a battery left sitting on such surface will never again properly hold a charge. Or those particular surfaces will cause a battery to lose some of its charge.
Oddly, the reality behind this peculiar automotive belief somewhat mirrors the long-standing urban legend about a mysterious and seemingly nonsensical cooking practice
Car batteries used to be encased in hard rubber, a substance that was porous enough that battery acid could seep through it and create a conductive path through the damp concrete, draining the battery. The cases of today’s batteries, however, are made of sturdier stuff that far better contains their contents than those of yesteryear. As well, time has brought technological improvements to the seals around the posts and the vent systems.
These days, the problem of car battery electrolyte seepage and migration has been all but eliminated. Says battery manufacturer Yuasa, "Nowadays, containers are made from a solid plastic that does not allow any current to flow through it, so the batteries do not discharge, even if they sit in a few inches of water."
Interestingly, some experts (including Car Talk's Click and Clack) believe that storing car batteries on concrete floors might actually be a better idea than keeping them on shelves or other surfaces because the cold of the floor works to slow the self-discharge (leakage) rate.
Barbara "cold comfort" Mikkelson
| Car and Deep Cycle Battery FAQ 2011 |
Magliozzi, Tom and Ray. "Click and Clack: Car Talk." The Dallas Morning News. 7 April 1999 (p. C3).