I built the low power version as described in the link that Bryan1 posted.
It does work, albeit slowly. Anybody expecting overnight miracles from such a device will be disappointed.
I could watch the white stuff slowly disappearing by peering through the filler holes on my old Trojan SC225 battery. The battery was connected to a low amperage, constant voltage, charger for the duration of the 'treatment'.
5 of the 6 cells retuned good hydrometer readings after the desulphator had been 'at it' for a week or two. The 6th cell always read a bit low, I guess its had it, 6 years is a fairly good life span for these batteries :wink:
A word of caution, do NOT accidentally connect the desulphator in reverse polartiy, it dies instantly :evil:, don't ask how I know this :cry:
Klaus