Dropping the trusty old shop camera on the concrete floor turned out to be a not so good idea...
but, in the spirit of true Mad Modding...
the trap door that held in the batteries did not survive the fall. Happily, had a 2-AA cell battery holder in the junk drawer:
some soldering (in the depths of the battery compartment,
) and some hot glue,
and there you go, good for another decade before I'll have to drop it again