I just bought a digital camera. Batteries that came with it are Kodak "Digital camera batteries" oxy-alkaline type 1.5 Volt.
Needing a quick replacement I fitted some ordinary 1.5 Volt Alkaline batteries. Camera won't work at all on those.
These are brand new batteries, reading about 1.6 Volts no load.
Is this a conspiracy by Kodak?
They can't sell much film these days so perhaps they are trying to create a monopoly on batteries.
I have qualifications in electronic engineering but I am still mystified as to how the camera can detect any difference between the Kodak batteries and other types. Open cicuit voltage is almost identical and the voltage under load is not likely to be much different.