iOS 9 uses new tricks to squeeze more battery life out of the phone you already own

Apple touted a number of flagship features of iOS 9 during its WWDC keynote, but the company is quietly focusing on squeezing more battery life out of the phone already in your pocket. A session for developers titled “achieving all-day battery life” pushed that app builders need to be more conscious of how their code is draining the user’s battery and introduced new features to help catch battery thirsty apps. One significant feature of iOS 9 that Apple hadn’t mentioned previously stops your iPhone’s screen from lighting up when it’s face down on a table. Until now, the iPhone would light up for…

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