After a diligent search, I came across this site.

http://www.shaka.com/~kalepa/desulf.htm

This is do it yourself kit to make a 12V Lead Acid Battery Desulfation Pulse Generator.

There are version 6V & 24V versions also out there.

This is a circuit can deliver a big wallop of a shock, so be carefull!

I have not built one, but I'm planning on doing so soon.

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(perry@ofuzzy1.com), April 05, 2001