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Article #432Re: Semi [OT]: What is the black deposit on the underside of wet lead acid battery vent caps?
From: Dennis
Date: Mon, 27 Jun 2011 09:15
Date: Mon, 27 Jun 2011 09:15
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2521 bytes
"Rheilly Phoull" <rheilly@bigslong.com> wrote in message news:MqmdnVeUp46ZqpXTnZ2dnUVZ_vKdnZ2d@westnet.com.au... > On 6/27/2011 2:42 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. >> >> > The technical term is "Krud" :-) > Might be worn off the casing ?? > I nearly used the common trade term of "black shit", "krud" is more professional. It could be from the casing but I wouldn't think so as it's to be deposited on the bottoms of the vent plugs as if carried there by the electrolyte "bubbles" during charging.
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