Lenovo Thinkpad 8 "desktop mode"

I have been searching everywhere, but can't find a definitive answer to this very simple question. Does using the Thinkpad 8 as a desktop require you to run it on battery power? From what I can find, you can either use USB 3.0 to charge OR pass data -- to a docking station in this case.

Has anyone found anywhere that says DEFINITIVELY that you can charge the tablet and use it as a desktop at the same time? If you can't, then what the hell is the point? A desktop that can only be used for 8 ours (at best!) would be less useful than one that couldn't be used as one at all.