With Technical Services Manager Gale Kimbrough
Storing Batteries on Concrete?
Well, here we are within months of the new Millennium, and I’m writing an article about an age old question ..."Will a battery be damaged or mysteriously discharged by allowing it to sit on concrete?" At least once a month, someone calls and asks this question or asks for clarification on the subject
|Fact or Fiction|
|Well, is it true?
Will a battery be damaged or discharged by letting it sit on concrete?
Why then do so many people believe that concrete is a battery enemy? Years ago, batteries could have been electrically discharged by sitting on a concrete floor. My dad, for instance, owned an automotive shop for many years. In fact, I grew up on a creeper. My dad reminded me time after time, "Set that battery on wood! I know batteries discharge on concrete because I’ve witnessed it!" And he was right at that time.
|You see, the myth that concrete drains batteries does have some historical basis. Many, many years ago, wooden battery cases encased a glass jar with the battery inside. Any moisture on the floor could cause the wood to swell and possibly fracture the glass, causing it to leak. Later came the introduction of the hard rubber cases, which were somewhat porous and had a high-carbon content. An electrical current could be conducted through this container if the moist concrete floor permitted the current to find an electrical ground. The wise advice of the old days to "keep batteries off concrete" has been passed down to us today, but it no longer applies because of the advanced technology of today’s batteries.|
|For more than a decade, automotive and commercial battery containers have been made of polypropylene, which is a highly insulative material. In fact, the Interstate Batteries poly material is at least five times more insulative than the old hard rubber. Also, tremendous technological improvements have been made in the seals around the posts and the vent systems, which have virtually eliminated electrolyte seepage and migration.|
|The fact is, all
batteries self- discharge whether they’re sitting on the shelf or on
concrete. This is why we regularly rotate your inventory. As the temperature
increases, a battery’s self-discharge level also increases. Some lead acid
batteries discharge 4% - 8% per month at a temperature of 80°F. The level of
self-discharge is also contingent upon the type of lead plate alloy plus the
age and cleanliness of the battery.
If the battery has a surface layer of acid or grime, which is electrically conductive, it self-discharges more rapidly. This surface layer may actually allow you to measure the DC voltage across the battery’s poly case (using a 10 meg-ohm digital voltmeter). For that reason, we recommend that you always keep batteries clean, whether they’re in storage or in a vehicle.
|You may now be thinking that you know more than your grandfather, who tells you that batteries stored on concrete will be damaged. Next time your grandfather says that, I recommend that you just say "Okay" and continue about your business. I’m a grand-father now, and I know that we like to have our way and we like to be right. If my grandson, for instance, tries to tell me that concrete won’t damage a battery, you know what I’ll say? I’ll say if you drop a battery on concrete, it will be damaged.|
"Tech Talk" is a copyright ofInterstate Battery System of America.