If you picked up that yes there is an almighty EVF on the market and not just a concept or a fake award winner then it may interest you that the Cineroid EVF now comes with a power adapter. The Cineroid PA01 power adapter configures a few ways to give you powering options on the Cineroid EVF.
Need D-Tap loving with your camera accessories and not just camcorder juice then look up the Cineroid PA01 power adapter it is a great solution for running an EVF for a long shoot.
Cineroid PA01 EVF Power Adapter
Cineroid PA01 EVF Power Adapter D-Tap
Cineroid PA01 Camcorder Battery Power Adapter
For more info on the Cineroid EVF.