You're not alone. It's been a crazy mess. I used to be able to wake up using my phone starting at 5am and not need to charge it until I went to bed later that night - like around 11 or so. And that was with constant use and never closing out applications AND with my young daughter playing with it all the time. So I filtered through all of the suggestions online, followed every instruction on how to reserve more battery life, and it's a little bit better, but still - I haven't used it at all today, it's just sitting here and is already drained down to 45% after only 8 hours - UNTOUCHED. I read somewhere about needing to do a "reset NOT from network", but I'll need to look that one up again and try it before I have to physically go into a store for assistance. By far, undoubtedly, the most useless and counterproductive update of any update ever in the history of updates. Just wanted to let you know, it's not just you, and it's not just a feeling that you're losing battery life faster, you actually are.