At the WWDC in San Francisco, Apple senior VP of Software Engineering Craig Federighi announced that thewill enable improved battery on compatible devices.
By default, you should see an extra hour of battery life on iPhones running the updated operating system. There's also a new "low power" mode that Apple promises will net up to three hours of additional battery life on your iPads and iPhones.
Apple is making an effort to improve all aspects of the operating system's foundational features, designed to make the user experience faster and more productive. Meanwhile, Google is making similar adjustments to battery life and speed in the next version of its own operating system, called Android M.
Check out our full WWDC coverage for more details on all the iOS 9 announcements.
reading•iPhone battery life improvements coming with iOS 9
Mar 14•WWDC returns to the best city ever and nobody can tell me otherwise
Mar 13•Apple WWDC 2018 kicks off June 4
Jul 8•12 top iOS 11 features on iPhone and iPad
Jun 26•PSA: Don't install the iOS 11 beta on your primary device