I did a small test with the standard LoRaWAN.ino example.
When powered by LiPo battery via the battery connector the CubeCell board uses only 8.5 uA during deep sleep! 
When externally powered directly on the 3.3V pin, either by LiFePO4 (3.2V nominal) or by two Alkaline batteries (2 x 1.5V = 3.0V nominal) the CubeCell board uses only 3 to 3.5 uA in deep sleep.