sam c said:
i.e. devices for recovering a sulfated batt bank .
thanks sam c .
I built one, (one of the schematics on the web) and tried it out on a 50ah marine battery.
Battery voltage was 11.46 at the start after charging for a day.
After a week the battery voltage did rise.
After 3-4weeks I did manage to get the at rest voltage to 12.65
I would say that they do work.
But becareful that you dont over do it, it'll break the plates apart.
I did notice, periodic discharge and charging during the process moves things along.
Cheers