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Article #428Semi [OT]: What is the black deposit on the underside of wet lead acid battery vent caps?
From: Dennis
Date: Mon, 27 Jun 2011 06:42
Date: Mon, 27 Jun 2011 06:42
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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.
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