yes when I first got it I remember my battery life beaing really good when the phone was calculating my usage now it's really just average at best I have a battery pack tho so I don't mind but it could be better
So far my battery life is the same. But Ive been very disciplined about installing apps. Before something goes on my N8 I install it on my old N4 to A) see if I want or need the app and B) to see how much resources it uses , ram, battery etc.
In general Ive found any social media app or browser + wifi = faster battery drain. Not as much when using network data. I get about 3 days on a full charge.
I've noticed it, my battery life has never been as good as yours, but it was good for me and now it's noticeably worse. I was getting a full day with 6-7 hours sot, and the last two days for sure I've only gotten 3-4 hours sot having to charge by 6pm. I installed a few random apps some days ago and I uninstalled them to see if that helps.
Mine has gotten better. According to Gsam I'm running about 20 hours average with over 5 hours of screen time. Actually I can't believe I spend that much time with screen on but that's what the app says. I only install the apps I need and try not to install anything new but games.
I've had mine for 6 weeks now and it's about the same as when I got it. Some days great, some days could be better. All depends on how I use it. Some days I use it more than others. Hell of a lot better than my note 5 and that battery didn't start dropping til about 3 or 4 months or so before I got the note8 and I've had the note 5 since it came out.
I see a bit more power drain but I'm away in spain roaming and have hotspot on a lot to allow my mate use my mobile data lte/4g so I guess that accounts for a good bit, still 5 hour sot so not worried
I don't know if it's in my head but I actually think my battery life is better, I can regularly come home from work with 90%+ battery life and go to bed with over 75%
I'm obviously not a heavy user but I find the battery great.