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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?
 
Anyone here tried to repair a battery with sulfuric acid?
Sulfuric acid is what batteries use.
What happens is some of the Sulfuric ions bind with lead ions and form sulfites that deposit on the plates and block the electron flow.
You need to clean the plates first either by physically breaking the layer off or by electric shock using desulfating chargers.
Then you replace the weakened acid with fresh acid
 
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