"A scrapped battery I purchased for A$5.00 in April 2012 is still functioning today!
My son and I have not bought a new battery for at least three years,
and none of our batteries have died since fitting the units."
Toyota Landcruiser and Scrapped Battery Optimised
As far as performance of the Infinitum desulfators, I have one on each of the two batteries in my Toyota Landcruiser. One of the batteries was about 5 years old and probably near the end of its life, when I fitted the first unit (desulphator) in March 2012. This battery is still starting the cruiser.
The other battery is one I picked up outside a tyre service for scrap price of $5.00. I immediately fitted a desulphator and it is still running my 12 volt fridge/freezer as well as auxiliary starting. That was in April 2012.
Solar Deep Cycle and Tractor Batteries Recovered
DOUBLE YOUR BATTERY LIFESPAN