Hello Mark
767-300 Captain Sim, always impossible to have the cold and dark panel. I have tried everything.  :( :-/
First: When I load the plane it is always with BAT ON + CDU left ON right OFF. IRS, Fuel Pump, Lights etc… ON.  It seems to be  the DEFAULT Panel.
Operations:
A: CDU Left \ Menu \ Setup \ State \ Cold and Dark \ EXEC button = OK
B: CDU Left \ Menu \ Setup \ State \ Custom State \ EXEC button = OK
A and B same result when reload the plane it is always BAT on ON. And even if I choose States \ on APU, on restarting the plane again BAT is ON.
Here the problem:
C: CDU Left \ Menu \ Setup \ Option \ page 2 \ Load Default panel \ EXEC button = Doesn’t work
Ultimately the Option function is inoperative and does not work. If you want I can attach for you the Cfg file, from Cold and Dark, tell me how if you want. In this cfg file, I can't find the battery??