I believe this experiment may be flawed. A measurement of Specific Gravity
of the electrolyte is a more accurate measurement for "state of charge".
Unfortuately this number is a function of temperature, cell voltage is also a
function of temperature. Lead acid batterys also tend to self-discharge at a
rate of about 5% per month. Normal car batteries are not designed to
be discharged more than 25% before damage occurs. Deep cycle batteries are
designed to withstand more abuse. Car batteries are designed to be fully
charged there whole life. Battery voltage is a poor indication of charge,
the capacity will decrease much quicker. The proof maybe in a couple months
when the battery is installed in a vehicle and the key is turned. The
voltage will then drop instantly to nothing. Richard (all this worthless
knowledge came about from my electric Spitfire conversion project)
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REPLY FROM: White, Richard H.
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From: etaylor@nr.infi.net (Ed Taylor)
Subject: Re: battery still on concrete
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>Just an update, the battery is still at 13 Volts and holding. However,
>there's no MG electrical flux field near it because the "Honey, in the
>interests of science, I need to park my car in the garage" trick didn't
>work. And I inspected the contents of the sewer line under the battery,
>but didn't find anything other than you'd expect.
>
>Here's a plot of the results so far (logarithmic voltage scale):
>
>13 | --------------------------------------
>12 | '
>0 |
> then now
>
To Denise: Please send me a slab of your concrete, so I may install in my
battery box!!
Ed
Ed Taylor (etaylor@nr.infi.net)
|