If you have any dead NiCd batteries lying around you might give this a shot.
Some years ago my in-laws gave me a big Roybi cordless tool set, it included a drill, a few different types of saws, palm sander, flashlight, three NiCd batteries, and charger, all in a largish rolling plastic box. I had a full set of Dewalt cordless tools, ...but the thought was nice. This box has sat in my garage for years, unused. Friday I was board so I dragged it out to take a look at it, maybe sell, or donate it. As expected none of the 18 volt batteries would charge. So I decided to try the "jump start" method to revive the batteries, ...and it worked.
I used a battery charger set at 12v/50 amps, and a couple of nails in the clamps to make the process more precise. I touched the negative to the negative poll on the battery, and touched the positive to the positive poll 9 or 10 times in quick succession. (yes, I was wearing heavy leather work gloves, and eye protection...which I recommend). Two of the batteries revived on the first try, the third took several attempts to make it charge. All are holding their charge, and two are holding a slightly higher charge then they were originally rated.
Just thought I'd pass along a net little trick that might help someone out. Now back to your regularly scheduled GD programing.