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From: amirza@silver.ucs.indiana.edu (anmar mirza)
Newsgroups: sci.energy,sci.environment,sci.chem,sci.electronics
Subject: Re: EDTA and lead acid cells
Message-ID: <1991Jan14.220336.9751@bronze.ucs.indiana.edu>
Date: 14 Jan 91 22:03:36 GMT
References: <1991Jan14.185450.24785@amd.com>
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Organization: Indiana University, Bloomington
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In article <1991Jan14.185450.24785@amd.com> phil@brahms.amd.com (Phil Ngai) writes:
>I just saw a magazine called "Home Power", with an article about
>sulphated lead acid cells. They claim you can rejuvenate them by
>putting a few teaspoons of EDTA in. Does this seem reasonable,
>or just hippie-dippie mumble jumble?
>
>It would be good to reduce the amount of lead thrown away or leaked
>into the environment. (anyone see "Global Dumping Ground" on PBS?)

Yeah, some friends of mine and I were very interested to read that. As
soon as I can secure some I am gonna give it a try. I have a couple 
of highly sulfated batteries lying around.
Another way to get rid of sulfation that I have heard is to remove the
acid and fill with pure water. Then charge at a high rate until the 
battery accepts some current then charge at a reduced rate.
Then drain the water and refill with new acid sg 1.285. I am going
to try this one as well. 
Another thing this old battery book I have mentions is lowering the sg
of your acid for standby batteries. This reduces their cca's somewhat,
but also reduces their tendancy to sulfate. Down to about 1.2 for a
fully charged battery. 

I'll post results when I get them.


--
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