On Mon, 25 Apr 2016, N_Cook wrote:

It seems the plastic housing has deformed to slightly oval tubes or
something, but no rechargeable AA size batteries (2x2) comfortably slide in
and out. Had to cut in from the side to make an access point to lever out the
2 deeper AAs, wedged in ther, no corrossion , just lack of freeboard. Any
ideas how to enlarge the bores a bit, no engineering reamer available. Those
silly sandpaper cylinders on a rubber cylinder "mandrel" for "Dremmels" would
do the job if there was a way to extend the shaft. I'll try the core of a
"choc block" connector as a coupler, but any other ideas?

I'm not sure if it's "deformed".

I have a Garmin, sort of slender and long, and I've had some trouble with
rechargeables in there. The battery cover has a thing in the middle that
you twist to lock it closed. That has been a tight fit. I seem to recall
trying the thing with alkaline AAs, and it was easier to close that cover.

Michael