I had three batteries pulsed with my homemade pulser. They were pulsed for a total of approximately 20 hours over two sessions.
Initially they were all registering zero on the battery load tester. One would indicate there was 12 V, but when the test button was pressed the needle would drop to zero in a hurry. The others wouldn't register at all.
The long and short of it is that two of the batteries are borderline OK, and one is a write-off. I don't know why one wouldn't respond after 20 hours pulsing.
The other two batteries (3 A/H & 6 A/H) were, as I said, borderline. They fell in the region between 'good' and 'bad.' So they'll work, but they'd be a cause of worry.
I am trying one of those 'borderline' batteries again to see what improvement is possible with my pulser after three goes.
* I have a question:-
If sulphation can be cleared and the sulphur put back into solution - by for example using resonance of the sulphate crystal, would the battery be considered charged? That's a bit obvious I suppose. I ask because I wondered whether using resonance to break the sulphates down and return them to the electrolyte could charge a battery the same way as a normal charge?
I am asking because I wanted to know if it was possible to take a different approach to desulphating batteries and charging them. If the sulphates are returned to the solution in a way other than straight-forward DC charging, and it can be done using much less energy, then wouldn't this be interesting?