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caverdude
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According to Steven Harris  there is nothing that can be done for batteries that have hardened sulfated crystals. Sulfation is part of the charge/discharge cycle happens during discharge, but if not recharged soon enough the sulfation becomes permanent.

Episode-1040- Steven Harris on Battery Back Up Systems Part 2 of 2

Episode-1039- Steven Harris on Battery Back Up Systems Part 1 of 2

He states this on one of these two podcast about battery backup banks.  He says anything sold for this purpose is a scam. The key is to keep your batteries top off with a 3 stage charge controller.

https://blog.larrydgray.net