Mic wrote:
http://www.pulsegenetech.co.jp/en/what/index.html

NANOPULSER is an Electronic Desulfator Device that conditions your
battery for better performance.

....

Any comments?

I don't know about this particular device, but based on the
recommendation of a friend with 25 years of live aboard experience,
I've had one of the gadgets on my boat since it was new and have never
had a sulphation problem in seven years of hard use.

I never heard a claim that they don't work, though I have heard a few
say the keeping a battery well charged works just as well.