Unless I am mistaken,
my Pentax K-1000 (no longer being built) which I purchased in the 80s was the last 35mm SLR film camera manufactured that could still take pictures if you removed the battery. The battery was used only to operate the viewfinder light meter.
There is a lot to said for analogue devices, and even more for purely mechanical ones. It's why I still take a sextant with me when I go sailing.
