I used to be very OCD just to TEST how long I can go with it. I am not as much as I used to now that I turned the % off and have other smartphones doing the Wi-Fi and music duties. Besides, it is healthier to keep the battery topped off which I am guilty of not going as I always tended to wait until it died. Now I just charge it whenever it is getting close to 20%. The usage tends to lie sometimes too. I did not use my phone for 5 full days last week. No apps opened but did occasionally glanced at the time from the lockscreen which was about 5-10x. The screen shuts off in less than 10 sec. My batt % was on and it was on airplane mode. By the 5th day (Friday), it was only down at 95% but the usage said 28min.
So just turn off the batt %, keep it topped off, and don't always trust the usage time.
So just turn off the batt %, keep it topped off, and don't always trust the usage time.