In my D850, as I said I have battery issues having a very short time and being antiped overnight even if the camera is off.
I noted also that in the SETUP MENU, in MD-D18 battery type, the option by default was LR6 ((AA alkaline) whereas other options were AA Ni-MH or AA lithium). Would that be the origin of the problem ?
What to choose between AA Ni-MH or lithium ? My battery is EN-EL15a 1900mAh 14 Wh.