4everplan, I use a sony xperia z3 compact. I have been impressed with the battery overall, it seems to last longer than my previous phone at least. Usually if I make sure to stop the track recording when we stop for lunch or take long breaks and over night, it will get me through almost 2 full days of use as GPS and camera (down to 10% by the second evening on my last trip). I use backcountry navigator pro for the mapping functionality. I also keep the screen pretty dim and don't take a ton of photos, which might help a little bit with battery consumption. Most of my trips are 2-3 days unfortunately, but almost the perfect length for my phone!

It really seems to depend on the phone (and how much you use it); I know my old phone would have lasted a day at most with the same usage. Best I can say is give it a shot and see how it works for your phone!