Yea, my intended use is just for a few minutes without mains power. Or left running for an hour. Not family pics or broadcast video.
So battery is essential.
Picture quality is not the first or even the second priority. My real question is - is Android TV essentially the same as a Tab or Phone in respect of Apps?

Think forthcoming attractions at our Stroud Ceilidhs series
A sort of more flexible banner. Any whitish surface I can find would serve as a screen.

The novelty value of the wheeze makes the message more memorable.

It looks like some models come with an Office reader installed - eg Power Point.

There is another use in displaying Irish Sets - anyone who has tried dancing/calling Irish Set will know - even the caller (in set) needs large print! Or large glasses when calling from the stage!