The introduction of iOS 9 brought with it a number of feature additions and much-longed for functionality improvements. Rather than reinventing the wheel and attempting to serve up a whole new set of core features, iOS 9 exists as more of a stepping stone for what is to come and attempts to stabilize its core offering with a number of stability improvements that should make the whole experience more pleasurable across all devices. iOS 9 does however, introduce one very impressive little feature that should make a difference to a lot of users - Low Power Mode, which is designed to save battery life by reducing the performance of the device and preventing consistent background activity.