[Arran]

The battery voltages are 1.5 volts DC and probably 90 volts DC, if it uses tubes like a 1A7, 1N5, 1H5, 1C5, or the loctal versions like a ILN5. You can probably cross reference the battery model numbers someplace, although the schematic will likely have the voltage shown like on the screen and plate of the power output tube, or tubes. That being said these battery sets still suffer from the rotting rubber/gutta percha covered wire that most early 1940s Philcos suffer from, but it will not be as bad as an AC set usually, the battery cables will be the worst and should be looked at. You should let Ron add the picture to the gallery, I noticed that there is only a B&W photo from a book or sales brochure.
Regards
Arran