[crooked-v]

I would bet that the pad in question has LEGO studs on it that connect to a physical charging circuit to the bottom of the brick. They've had various motor bricks for a long time with similar connections.

[micromacrofoot]

it's an induction tray like any other wireless charger

https://www.theverge.com/tech/855520/i-played-with-the-lego-...