I think that Howard is referring to the blue Vindian which is fogging the issue. I don't think he can see the wood for the trees!
I seem to recall reading that the Vincent Indian in the picture on the link (http://strokeman0.tripod.com/Vincent/vincent-day.htm ) provided by Trev was unfinished and dummied up for the photo. Hence the wooden block instead of a battery. The intention was to build a bike for the American market and it was intended to use the same lamps, switches and American dynamo as the Vindian, but obviously with a more upright drive system. At the time of the photo the dynamo didn't need to be working as no battery was there to be charged.
See http://strokeman0.tripod.com/Vincent/images/Vincent_Indian_pic_9.jpg for the prototype in question.