Presumably a common problem, but new to me, open to any suggestions.
http://home.graffiti.net/diverse:gra...net/MZR90a.jpg
side view
http://home.graffiti.net/diverse:gra...net/MZR90b.jpg
mm graph paper
Show the battery closure with the little cover of sliding plastic removed.
L is over the latch to free the plastic
+ is over the really fllimsy battery connection which of course is bent away
so
no longer making contact. So feeble that there is no point in bending back
although for illustrative purposes I have for the pic) as it will soon bend
back or fracture.
At the moment I'm thinking of cutting a bit from phosphor bronze shim and
rivet/soldering with an eyelet+tiny washer through that hole marked with an
R and doubling up the existing.
Not possible to sensibly remove this hinged brass as the pintle is rivetted
in by the look of it.

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Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/