Big tablets are not new, I've had a 21" tablet for ages...
No battery, but who is going to pull out a 17" tablet on the train?
I have it hanging on a wall in the kitchen (vesa mount on back), beats the shit out of having a crap telly there. Running Kitkat 4.4.2 and cost about 180 quid direct from HP last November. Its 1080p, HP provide an app that lets you have two apps on the screen side by side .... I got rid of it tbh.