I'd like someone to confirm this 80% thing. Who knows it might be all iphones! Maybe everyone should do a benchmark and inform their battery status and a graph and be plotted.
Dial111: Thought I'd test the theory and benchmark my partners iPhone 7 Plus purchased July 2017 as she wanted to upgrade to iOS 11 and yep, score was significantly lower immediately once it was upgraded so it has been gimped imo and phone isn't even 6 months old.
Post upgrade, the score is lower then a 6s plus and a iPhone SE lol
Reading that makes me wonder, but as we've seen, some will say apple are doing a good thing!