This worked for me too, though I was a bit reckless. I literally got an old 1A Samsung
phone charger, cut the end off of an old USB cable, stripped the wires that supply current, cut open the power cover, and touched to the battery connectors in the power cover for about 5 seconds at a time, measuring the new voltage each time until each was well over 3V (took about four or five times each to get them revived to the point that it would charge again). Worked like a charm, though I had heavily protected my hands, face, and body in case something went horribly wrong. For what it's worth, I can't recommend you do this, but I got to the point of not caring what happened to it if it didn't work (and again, I had gone to great lengths to make sure I wouldn't be injured if a battery exploded). It's been chugging along fine now for about six months.