A huge and much-needed addition to the iOS universe, was a way to save battery life on devices running low on juice. Previously, iOS 8 added the option to view how much a particular application was consuming battery. But now, when you go to Settings -> Usage -> Battery, you’ll not only see battery consumption metrics, but also Low Power Mode, which temporarily disables features, giving you up to three hours of extra battery life. (iPhonehacks.com)