Pretty much what they do is remove the sulfate. Since that is a pretty inert substance, it means a mechanical removal. On starting batteries, if they use a sintered plate it could mean early demise.
Anything that exposes fresh plate material will cause the cell to appear "refreshed", except watt hours decrease.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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