I ended up buying one of these units and picked it up in a face-2-face transaction. Definitely from an ARINC project.
So perhaps the question now is, can these units be upgraded with the new battery and back cover? I mean will iRex let us pay for the upgrades, not whether or not is physically possible.
..and I like Adam's question as to whether iRex would just ship the back cover and let him do the install. I figure that if the cover is removed, replacing the battery would then be dead simple. Can't be that hard!
-Jeff