Been trying to 'desulfinate' a 13Ah lead acid battery now for a few weeks. The method I used is to run 200 mA at 16V into a 12V battery. The battery had only 1/10 of capacity, now it has 1/8. Takes too long for my liking, would several month that way.
So did some googling, and found this circuit diagram only:
Basically a flyback where the flyback impulse goes into the battery. You can buy that sort of stuff on ebay too (30$ ex shipping):
Anybody any experience bringing old sulfated lead acid batteries back alive? Circuits?