why you dont show how much storage you used total ?
song ?
video ?
photo ?
brightness 40 % change to 80 %
i bet you not gotta get 9 hour if include above setting
Someone please correct me if I'm wrong but I don't think the amount of storage you use is tied in any way with your battery life.
I suppose one could argue that the more you have on your phone, the more likely you are to use it, but that's not necessarily the case, in my opinion.