[potash]

Why not? Unless I'm missing something, constructive interference is still additive and power loss is still inverse square.

Of course batteries also have power transmission inefficiencies. My intuition though is that wireless power has potential to be more efficient than batteries for two reasons:

- While building out the infrastructue is an enormous proposition, I'd guess that it is much more sustainable to maintain than batteries.

- When the application is propulsion, not having to carry a fuel source (e.g. battery) is huge. On a Tesla Model S, the battery is more than a third of the weight (450kg of 1235kg, according to Wikipedia).