Where are you seeing this? iOS 9 is supposed to have better battery life than iOS 8, but I don't know where it has been stated that iOS 9.1 would have better battery life than iOS 9.0.
Where are you seeing this? iOS 9 is supposed to have better battery life than iOS 8, but I don't know where it has been stated that iOS 9.1 would have better battery life than iOS 9.0.
I get about 11 hours of usage, and 50-65 hours of standby time on my 6 Plus with iOS 9.1. That is the same amount of time as I had in past iOS versions.