I can say without hesitation I'm getting between 1-2 hours usage less per day average the moment I upgraded to 9.2. Hopefully this will change with the next update.
I just bought an iPhone 6s Plus and when I'm using it, I can only get 6 hours of usage and 10 hours of standby. I know that the phone is only 2 days old, but it's very poor. So is it gonna change after 1 week or should I just replace it now?