Although hard to see in these pictures, there are 5 little foam oval widgets, 2 down one side of the board, and three down the other, each covered with a silvery conductor. The ones on the side with 3 make contact with a lead with bare patches adjacent to these widgets. If you look carefully at Picture 5 in the first posting, you can see the lead on the side with three, running down the edge - one contact is near the mid-height of the battery housing, and the other two are roughly at each end of the battery housing.
Sorry for bumping an old topic but could those foam widgets be the reason my touchscreen is not working after I opened my phone to clean it? I managed to damage one of the oval thingies while opening the phone, the one of two not directly connected to the wire, on the other side.