I think the battery is average. Consider it comes with a big 21:9 ratio screen. It depends on what apps you mainly use and how long you run that apps. A 3000mAh battery is a decent size. If it is a larger capacity battery, the design of this phone might be thicker.
On the other hand, you can adjust to a different mode to help saving the battery. It has a few options to select. You can change to balance mode or battery saving mode if you are not use it for gaming. However, if you use this phone as a main gaming device, you need to select performance mode to provide more horsepower to run the gaming apps. That will drain your battery as it requires a full use of ram, screen, and cpu, etc.
It does take a bit time to fully charge.
