I did find OVRInput.GetControllerBatteryPercentRemaining() in Oculus Utilities for Unity and although its summary says "Retuns the battery percentage remaining for the specified controller. Values range from 0 to 100. Only applicable to controllers that report battery level, such as the GearVR Controller. Returns 0 for controllers that do not report battery level." Sadly seems the Oculus GO controller reports 0 :disappointed: