I got 25hours of backup with 5 hours of screentime and 2-3hours of music. And I was playing stick cricket most of the time so that drained a lot of battery too. My phone usually lasts 2 days with ~6hours of screentime and music
I'm a pro in saving battery while not compromising on functionality, been doing it from over 2 years now. I even use Google Now which drains a lot of battery, it's handy for summer football transfer news.
I've just disabled Sony's bloatware that seemed to eat a lot of battery. I don't even use stamina mode.
Tapatalk seems to downscale the resolution if images for some reason