I know it's a bit early to say what the impact of 11.1 is on battery life, but this is a thread to report your experience as it becomes available. It's important to include 3 pieces of info:
1)What device and model this pertains to: iPhone, iPad etc. which model, generation and so on.
2)What you are making a comparison from: are you going from 11.0.3 or 10 or what.
3)What is your experience of the battery life from 11.1 compared to what you had before.
Battery life is a super important thing for most people, so this would be helpful in letting people know what they can expect.
1.) iPhone 8
2.) I would like to compare it to the iPhone 7, which was my previous phone. I believe iOS 11.0 had a huge hit on battery life on my 7. The 7 wasn't known for it's exceptional battery life so you can imagine how bad it was becoming. I return home with my 7 at about 18%-20% with about 2 hours of off-screen audio streaming. The rest would be Safari browsing, manual mail fetching for a few minutes and texting. This is my usage habit. Ever since I got the iPhone 8, when 11.1 was already available, it was a breeze. It felt the hardware and software function together. Battery life was substantially improved and I can only pinpoint it to the much better A11 chip which could have had a bump in power efficiency. Now I would compare my new iPhone 8 with 11.1 with an iPhone 7 I got a year ago on launch day with iOS 10. The 8 is a better phone with the 11.1 out of the box.
3.) It has been great. Currently at 6 hours with 39% of battery juice left. I don't have to keep checking my battery percentage (which I turn off) every time I browse Safari for an hour or so.