The Sphero BB-8 App-Enabled Droid uses a proprietary charging method to wirelessly charge from its base. Using the GRL-A1 power analyzer, we can see that the Sphero pulls 3 watts of power through its USB AC charger. Click here to download the trace captured by the GRL-A1 power analyzer to see more details on how the BB-8 App-Enabled Droid wirelessly charges from its base.
To see how the Sphero works with the Qi wireless charging standard, we placed the Sphero on the Qi based Samsung Fast Charge Wireless Charging Stand. The Sphero is unable to sustain a charge after being placed on the Qi charger (click here to get the trace).
Download the A1 software from Granite River Labs here to view the trace.