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Article #436Re: Semi [OT]: What is the black deposit on the underside of wet lead acid battery vent caps?
From: TTman
Date: Mon, 27 Jun 2011 15:29
Date: Mon, 27 Jun 2011 15:29
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"Dennis" <dennis@blibber.com> wrote in message news:o7-dnSpXZMnau5XTnZ2dnUVZ_o6dnZ2d@westnet.com.au... > > 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. > Defo lead oxide...
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