I have an iPhone 5S. I really enjoy it, BUT the battery life is't that great. I don't travel much, but when I do and I am not near power - I have lots of battery cases and battery packs that I travel with. This shouldn't be. Look at the screen shot above. This is from an iPhone 4 running the latest iOS. Of course, I only used the phone for 3 hours, but it was in standby for almost 2 weeks. Why can't the latest iOS devices get this kind of battery life?