In the past yes batteries stored on concrete floor would loose charge because of the free electrons grounding themselves outside of the battery.
Store car battery on concrete floor.
Batterystuff knowledge base article answering the popular question about battery storage.
Outdoor storage if you must store outside on an earth surface the best you can do is park the car on a layer of plywood over a continuous.
Some of us refuse to store a car or boat battery on concrete because our mechanic or trusted friend said it will drain the battery.
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.
The other way around isn t always true with an already damaged battery leaking battery acid on a concrete floor potentially causing some damage.
Turns out this myth had some truth in it but is no longer relevant with today s battery construction.
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.
Even an acid spattered battery will not leak its charge into the earth.
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.
If it s acid spattered put it on somebody else s concrete floor or stick a board under it.
If a battery is clean you can safely put it on your concrete floor.
For example a battery that lasts 4 years in a cold environment would only last 2 years and 8 months in a hot climate.
There may be leakage across the terminals of a top post battery but that would be slight.
So while the battery might not be discharging on the cement floor it might be cooling off and be less able to pump out its power temporarily.
If the concrete floor underneath was wet the wooden case would.
So here s the story.
Early batteries were constructed from wooden crates holding glass encased cells.
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.
A battery s discharge rate is only affected by its age the outside temperature and the.
Interestingly enough many experts such as car talk s click and clack think that storing car batteries on concrete floors might actually be a great idea because the cold concrete can help slow down the self discharge leakage rate.
That s why we store all of our unsold batteries on our living room sofas tom.