desulfators will not improve on this result, because they cannot
all the acid has been driven back out and into the electrolyte solution.

if you have a battery that after several hours of charging followed by an equalization charge of sufficient voltage still does not come up to around
the full charge specific gravity, then try the desulfator to see if it can get the
specific gravity up the rest of the way.

that is where the rubber meets the road :)