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Message: <blockquote data-quote="airshot" data-source="post: 507689" data-attributes="member: 1183"><p>I have had them bring back very weak batteries but never a totally dead one. That descaling mode is part of a maintainers operation.  Depending on the brand, they have different terms for the job they do. I would never trust a battery that came back from the dead in my vehicle or my boat, but I have had them sit on my garage shelf to use when an emergency arrises, especially a jump start when my grandkids leave their lights on !</p></blockquote><p></p>