15.6" not bad, doesnt have built-in battery but seems like power consumption is low enough to not need be charged while plugged in to phone/laptop.
Works out-of-box with my x280 Thinkpad for both Windows and Ubuntu. Cables available for various combinations of display and power setup. I am using power adapter on one of the monitor's USB C port. USB C to USB C for display and powering my laptop. So all in all, I only need to bring one addition USB C cable with the monitor in this new setup. Colour of monitor is clear and sharp. Sound on monitor speakers is also much better than my laptops.