The easiest way to charge Aido is to use the optional smart charging dock that lets Aido charge autonomously:
Aido’s dock has a specially designed set of two charging rings, one of positive polarity and the other negative
The charging rings are designed in a semi-circular fashion to increase probability of touching Aido’s charging circuits, no matter how Aido rolls into the dock
The charging rings have special circuitry to prevent a short circuit in case it encounters a foreign object
Once Aido rolls into the dock, the charging rings are activated and drive charge to Aido.