Yes I was warned but IOS 8 is seriously eating up my battery on my iPhone 5s. I did an OTA update, not a clean install. I'm not too worried because I'll be getting the iPhone 6 on Friday and I will be wiping this phone. In just a course of 30 minutes I went from 100% down to 86%. My phone pretty much lasted all day with normal usage and I would still get home with 45%. Anyone else seeing this or suggestions.