I wanted to open them up for two main reasons: to see if it's possible to replace the cell, and to examine deception in the replacement. Both batteries were easy to open up by cutting along the seam. There are tabs, but I think the cases were welded or glued. Here's what's inside:
In the original Li-10B, the cell fills the case. There is only some very thin double-sided tape on one side, and a bit of very thin insulating tape. The replacement contains a thick foam rubber spacer, and a thinner paper spacer. The cell thickness difference is easy to see. This is at least part of why the "1400 mAh" battery was lighter than the Li-10B.