Oil sucks, wind blows.
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I salvaged the starter battery from a lawn mower recently. It was reading zero volts, but I charged it up and it starts a lawn mower again. I'm not sure it can be called "saved" but at least it works well enough for me!
Try a trickle charge and then a load.Might want to try a heavier, normal, charge for a little while to get them up a tad before the trickle charge. Just to save a little time.
Also, for a normal charge rate, watch the volts for the first few minutes.If the voltage climbs unreasonably fast, it is shot.
Example: If the 4V battery goes to 14V in 90 seconds with a 3 amp charging current, it is shot.
I have a 12V 7AH at 7V. I use it for testing controllers.A 1A charge current gets it to regulation voltage (14V) in about 30 seconds.Then I can see how the controller is working.Test it again in a minute off the charger, when the voltage drops to about 9V.And I thought it was only junk.
G-
I've been busy reading, cross referencing, scrounging parts from discarded cpu power supplies, monitors, printers, and the like building my first desulfator. It was quite frustrating at first. Built a modified AC circuit 3 times before I realized the circuit was for a PNP and my scrounged mosfet was a NPN.... DOH! Finally got the sucker humming away working on a couple of old heavily abused maintenance free DieHard wheel chair batteries.... with fingers crossed. Good luck!