Exchange users plagued by shortened battery life now have respite in the form of iOS 6.1.2. Apple released the update to its mobile operating system on Tuesday, bringing a fix to the issue encountered by many users.Related StoriesiPhone 6 rumours: 'iPhone 5S motherboard with quad-core A7 chip' leakediPad mini 2's Retina display could add 30% t component costs - reportApple working on USB 3.0 support for iOS