On Thu, 20 Mar 2008 08:54:22 -0800, "SteveB"
wrote:

I have heard that if you sit a battery on the ground or concrete that it
will lose its charge faster. Is this true?

Steve


Here is a theory. If the floor is colder the ambient air, the battery may
develop a thermal gradient. Since lead acid batteries have a temperature
coefficient that will set up a vertical voltage gradient within the cell.
That voltage gradient will cause a current to flow within the cell leading to
discharge.
--

Boris Mohar

On Fri, 21 Mar 2008 12:04:38 -0500, "Randal O'Brian"
wrote:


"Boris Mohar" wrote in message
.. .
On Thu, 20 Mar 2008 08:54:22 -0800, "SteveB"
wrote:

I have heard that if you sit a battery on the ground or concrete that it
will lose its charge faster. Is this true?

Steve


Here is a theory. If the floor is colder the ambient air, the battery may
develop a thermal gradient. Since lead acid batteries have a temperature
coefficient that will set up a vertical voltage gradient within the cell.
That voltage gradient will cause a current to flow within the cell leading
to
discharge.
--

Boris Mohar

It's more than a theory. Submarine batteries typically had "bubblers"
installed in each cell to keep the electrolyte stirred. This prevented
temp stratification in the large cells. See
http://books.google.com/books?id=1HS...en#PPA1 17,M1

Randal


Thank you Randall - that is one of the cites.

--
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