That makes a really nice display. I do some volunteering at the Anson Engine Museum up here which has a local history room - it would be nice to do something similar, although I don't have a battery set at the moment and I do like the 'running costs' angle that this makes possible.
I'm not yet 50, and even I remember how restricted I was in the 70s / 80s regarding running toys / torches / bike lights on batteries, in that it was really hard to persuade Mum and Dad to buy any. My kids don't know they're born, harrumph, mumble, grumble
