They are wrong. When I was a kid, my dad had a place on a wooden shelf for
storing the extra battery. NEVER store it on the concrete floor I was told.
Well, I of course knew it all, and the floor was a better spot, as I had
something else I wanted to put on the wooden shelf. Dad was right. Sure
enough, I dropped a big wrench on the battery, shorting it out with big
sparks aflyin! The battery discharged of course. So, NEVER store a battery
on a concrete floor!
(In the olden days, the battery case was made of different material, and it
could discharge through the case, more so if on a concrete floor. Them days
are long gone.)
Why will it take you two years to scrap the lawnmower? Why so you
want to preserve the battery for that period of time (instead of
discarding it or putting it to use in some *other* device before
the mower is scrapped)?
How much do you have invested in the battery? I.e., is it really
*worth* anything to that (yet unnamed) potential future use?
Is the battery sealed/"maintenance free"? If you can drain the electrolyte
("acid") from the cells and store it *separately*, you can preserve the
battery almost indefinitely. Then, refill it and use it immediately.
In my experience, batteries deteriorate. Draining and storing the
electrolyte separately would be a good way to prevent that.
If the battery is a 12 Volt Gel Cell, I suggest keeping it connected to
a "Battery Tender Plus" when not in use. It will maintain an unused
battery for an extended period, but not forever.
You might be surprised how much some Gel Cell batteries cost. My Honda
generator uses a Yuasa battery that is also used in some motorcycles. I
found one at a Yamaha motorcycle shop for half the Honda price, but it
was still expensive!
IME, many "tenders" are cheaply designed -- little more than a transformer
and a diode (counting on the transformer windings to limit current).
As line voltage fluctuates, so will the output "float" voltage of such
a device. "Overcharging" is a surefire way of toasting a battery
prematurely. Unless *you* (or the circuit) are carefully monitoring
the *actual* voltage, all bets are off.
["batteries" are notoriously hard to charge as you tend to only
be dealing with two terminals (by definition, a battery is more than
once *cell*). So, if any single cell goes wonky, the charging
algorithm for the entire battery is faulted.]
Remove the battery from the machine. Store it in a
cool cellar, which does not freeze. Sit the battery
on wood, not cement floor.
Might want to put the purchase receipt in a plastic
Ziploc or similar bag, and store near (but not
touching) the battery.
Christopher A. Young
learn more about Jesus
The reason not to put/store a battery on a concrete floor is that the acid from the battery will destroy the concrete!! Basic chemistry here.
"Olden days" batteries were prone to develop leaks and if stored on wood shelving, the wood would absorb the leaking acid preventing damage to more important things like a concrete floor.
Where I worked thirty years ago, there were large banks of batteries in
glass cases. As the result of some employees coming to work and finding
acid on their desks from batteries on the floor above, a "tray" was
installed that was large enough to contain a battery's contents.
The best material for such a tray is probably fiberglass, although a
falling battery would probably fracture it. Someone in a high position
decided that they had to be made of stainless steel, which also reacts
with battery acid. To satisfy that requirement, it was necessary to
paint the stainless with a thick coat of acid-resistance paint.
Last I heard, they had converted to some kind of sealed battery.
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