That sounds about right. Mirrorless cameras need to do a lot of image processing and that affects battery life significantly.

Not nostalgia, DSLRs get vastly better battery life than mirrorless cameras. Because there is nothing using electricity in the optical path, you're just looking through the lens. A mirrorless on the other hand is constantly using power for the screen.

Battery life if great, during a full week in Iceland I charged the two batteries once, and propably wouod have made without charging. Resultion is, at least for me, only proplem when it comes to cropping. Not cropping in changing the format or to cut of the corners (the D700 viewer covers only 95% of the picture which can lead to some stuff at the borders of teh image you don't want there) but rather croppong out stuff like bird to enlarge them. Then, and only then, the 12 MP are an issue. Otherwise a lower resolution forces you sinpmy take better pictures in the first place. And for online use 12 MP are plenty anyway, I don't plan to print a house wall with my photos. And lower resolution means smaller files, which a benefit in itself.

I love that camera, if simply because it gave me back the joy of photography.