I used it as a camera in Japan and it lasts the whole day, only need to charge at night. But isn't that common with all smartphones.
Been using it as my phone and camera in Singapore also no problem.
Anyway to cut the long story short. This is a very capable camera but a so so phone. Not top of the line is phone specs.
Camera wise, you have more control over it, like ISO, aperture, shutter speed and focal length. And the addition of the tripod mount is very useful.
I put the phone into airplane mode, so that i don't get phone calls while it is on the tripod.