On the battery issue. A place I used to work had iPads stuck on meeting room doors with a webapp for booking and displaying who'd booked meeting rooms. They were puffing batteries in 9-12 months of being plugged in 24x7.

I got a few cheap power point timers, and set them to only charge for 1 hour twice a day, and we didn't have a battery failure in the 3 years after that while I was still there.

(Totally agree with the rest of your comment too...)