I noticed it too, But every time a new iOS comes out everyone does for the first bit due to using and setting the phone up. At first mine used battery FAST!!! Then after getting every thing set up and I stopped just playing around it went to very good battery life. So in my opinion after it is set up and not PLAYED with it gets a lot better. I am back to charging my battery every 3-4 days again like I was on 4.2.1 that I came from. Hope this is all of your issues too. Good luck.