The iPhone 16 Pro Max has the best battery life of any iPhone yet. Apple's new A18 Pro processor paired with a larger battery offers up to 33 hours of video playback, up from 29 hours on last year's iPhone 15 Pro Max. I was usually able to make it to about dinnertime before needing to charge the 15, and I can make it to bedtime — or beyond — with the new phone depending on how much I'm using it.