Raspberry Pi without wires

Many of us are already owners of the Raspberry Pi single board computer. There are a great many applications for it (only in Habrahabr now there are more than a hundred articles devoted to this device). But, they could be much more if it were possible to connect the Raspberry Pi without wires that reach for the router / power supply / outlet.
Partially this problem is solved by WiFi connected via USB. But what to do with the power wires, because it is not always possible to install and connect the power supply? Inspired by this video , I found a solution to this problem: