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Article #431Re: Semi [OT]: What is the black deposit on the underside of wet lead acid battery vent caps?
From: Dennis
Date: Mon, 27 Jun 2011 09:12
Date: Mon, 27 Jun 2011 09:12
36 lines
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2598 bytes
"atec77" <atec77@hotmail.com> wrote in message news:iu9d1e$o0o$1@dont-email.me... > On 27/06/2011 4:42 PM, Dennis wrote: >> Does anyone know what the black smudgy deposit is that forms on the >> underside of wet cell lead acid automotive batteries is? >> >> It looks a little like soot and is easily wiped away. >> >> I've heard it can suggest the battery is failing. Is there any substance >> to >> this or is it just an anecdotal red herring? >> >> Cheers >> D. >> >> > Oxide > is bad > > -- > X-No-Archive: Yes > It could be lead oxide - googling had found nothing but I just looked at lead oxides and found this: "The so-called black lead oxide, which is a mixture of PbO and fine-powdered metal Pb and used in the production of lead acid batteries." http://en.wikipedia.org/wiki/Lead_oxide We've got a few vehicles and most of them seem to have it to some degree - even on a couple of batteries that are only 6 months old.
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