I had the same problem, but got the idea to "jump start" the battery from
Googling the problem. At night, I had turned off my
MDA to charge the battery and then in the morning, couldn't revive it. I removed the battery from my
MDA, and determined which battery terminal was positive (far end of one side) and negative (far end of the other side) by using a
multi-meter. BTW: Battery was still @ 3.5V (okay…battery was still alive, if just barely). Then, I found a 5V DC charger (5W Max output = ~1A) from my
bluetooth headset. I used one wire (CAT5E) and connected it to the negative side of the adapter (outer sleeve - again, verified by
multi-meter) and another wire to connect to the positive tip of the adapter. I had to strip about 1/2-inch of the insulation off of the wire on the DC adapter side, and about 1/8-inch of the wire on the battery side. Plugged in the 5V DC charger and then I touched the negative wire to the negative battery terminal and held it there, while I touched the positive wire to the positive battery terminal for about 30-45 seconds. Put the battery back in the
MDA, started it up, and now it's charging on the regular
MDA AC Charger that came with the phone. Problem solved. I’m happy to assist further over the phone at
https://www.6ya.com/expert/daren_80e8def41854e57e