Could you please share some screenshots of those 3-4 days uptime? Because moderate use is relative. For me 3 hours of screen time is moderate. A graph is not open to interpretation.
Also have a look at this overview:
Reboots may help. Although they shouldn’t in practice. So it may be a bug, or maybe the batter estimation is affected by the reboot and thus it gives you an estimation since boot. Then of course it has little data to analyse and may be very positive. Unless you really get a few extra days of battery out of it.
I usually get about 12 hours of battery life, then it’s around 30% and it’s time to charge. Screen time is between 4-6 hours. With 6 hours the phone is really dead. But it really depends, when at home with WiFi it is easier to get a full day of battery life. Screen brightness also makes a huge difference. An LCD isn’t the most battery friendly screen.
