Good stuff Vic, and I agree with Andy about the locations for those items.
They're not batteries as such though, but accumulators and /or transformers, as the main, much larger battery was located normally in the rear fuselage, with the access hatch on the starboard side, or sometimes, in certain cases, below the radio, dependent on Mark and equipment fit.
Here's a pic showing the location for that on the starboard side, and you'll notice that they're so far down that it'll be virtually impossible to see them on the model.