I recently acquired a D850 and was happy to install the SnapBridge application in my Iphone which communicated very well with the D850. I found it practical. However, I noted that this interface between the camera and the Iphone is using up a lot of the battery even if I turn off the camera. After making a full charge in the evening of the battery and turning off the camera, the battery was totally empty the next morning. I tried to turn off wifi and Bluetooth functions in the D850 but this did not help. The battery is being empty every night.
How can I solve this problem ?