GBP & GBC CleanJuice Air | Indicator Lights
On the PCB of the CleanJuice itself, there are 2 LEDs and colors may vary. The light on the A/B button side of the console indicates that the module is receiving wireless power from your charger.
The light on the D-Pad side of the console indicates that the battery is currently charging.
For further charging information, please view this video around the 10:15 minute mark.