The latest iOS 8 comes with amazing new features — but boy is it a battery drainer. If you're using Apple's newest mobile operating system on an older phone, like the iPhone 4, 4S, or even 5, all those zippy animations can drain your phone's power. Apple even acknowledged that some iPhone 5's have awful battery life and will even replace the battery if you bought the device within a certain period of time. Prolong your iPhone, iPod Touch, or iPad's battery life with these simple tips.