My primary FOB is dead after one week. I may have left it overnight near the Model X, and (according to some) that drains the FOB battery with repeated interrogations between the FOB and the car. (I didn't know the FOB receives and responds, I though it was a transmit-only device.) My reserve FOB works fine, just ordered 3 extra batteries from Amazon. My iPhone Tesla App also unlocks the car. Good for a Plan B entry and drive away IF there's LTE reception, I suppose. But, I cannot unlock or start the car with the dead FOB near the base of the pillar between the driver's door and the Falcon Wing Door as specified in the manual. Note that the manual has a figure left over from Model S. Also, the car would not recognize the dead FOB when placed below the 12VDC adapter. Does anyone know where the RFID unlock is on the Model X? Have you used it? And, the drive-away position for a dead FOB?