Well I picked one up to see how good of a deal it would be for pulling the batteries...
Removing the case shows a very basic control board and battery cage.
Pulled the soldering iron out and remove the wires and board, I should have just cut them. there are two screws holding the two halves of the cage together
Working one side at a time, begin by removing the tape and mechanically removing the spot welded tabs.
These are only 1500mAh batteries, but they are Samsung and not a bad deal for $1.66/each.
Here is a spec sheet
http://gamma.spb.ru/media/pdf/liion-lipolymer-lifepo4-akkumulyatory/INR18650-15L.pdf