I think what you're referring to is battery De-sulfators, where they claim is that the build up of sulfates on the internal lead fins can be reduced, but even if those sulfates fall off they wind up in the bottom of the battery casing, they R still there.
There has been little positive results by those treatments based on all I read.
As far as the '09 batteries on you cart.
R you using the cart year round or is is it laid up for several months at a time.
Do U maintain the correct water levels only adding distilled water.
On average after 4 years you may just be due for a new set.
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