The Battery Life on Future iPhones Is Going to Get Worse The 'Washington Post' says that smartphone battery life is declining due to increasing demand on lithium ion batteries. Tests show that the Google Pixel 3 lasts 90 minutes less than the Pixel 2. Meanwhile, the iPhone XS lasts 21 minutes less than the iPhone X. The only exception thus far is the iPhone XR. When compared to other new iPhone models, the XR generated fewer pixels. Reports add that users with Android flagship devices are experiencing the same issues as well.