Just a shot in the dark here, since I haven't ever attempted what I'm recommending, but...
#2 pencil and a drop of super-glue? Drop of glue on the eraser, carefully slide it down the barrel until contact with the battery, hold it for a moment or so, see if it has enough traction on the end of the cell?
I dunno, just kinda popped in there...
Also, centripidal force approach-
A couple feet of string, tied/taped/attached to the head end, probably as close to the bezel as possible, go outside and carefully spin the hell out of the light. Be warned, the AA cell is probably going to have pretty good velocity if it does get free.
Anyways, hope this helps.
:wave: