CK5
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Repair battery with sulfuric acid?

I’ve heard that’s what the local used battery place does to get old stuff good enough to sell.
I have no idea if they do anything else to them.
 
So here’s something confusing. My Schumacher battery charger has a sulfide detector and goes into a desulfation mode. That sounds counterintuitive to battery shops adding sulfuric acid. Or is that to remove the sulfur?
 

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