Note: Battery life can vary based on usage and other factors. The times listed are based on Apple's official specifications. As you can see, the iPhone 14 Pro Max has the best battery life of all the iPhones listed, with a respectable 13:07 hours. In this story, we'll cover two features in iOS 16 and iOS 17 that both put a strain on your iPhone's battery to varying degrees and how you can turn them off to help preserve battery life. Here's Go to Settings, then "Battery" then toggle on "Low Power Mode." Low Power Mode saves battery by turning off or turning down some features such as email fetch, "Hey Siri," background app refresh Bigger screen, best battery. The iPhone 15 Plus offers everything great about the iPhone 15 but is better suited for larger hands and has longer battery life. $899 from Apple. The Apple iPhone 15 Considering Apple seemed coy about the battery life when it introduced the X, only saying it will deliver two more hours than than the old iPhone 7, I’ve been thoroughly impressed with it. The best iPhone for battery life (Image credit: Future | Alex Walker-Todd) 5. iPhone 15 Plus. The best iPhone for battery life. Specifications. Weight: 201g. Since the phone was introduced, it has faced numerous reports of poor battery life. Apple has tried to remedy the situation and has, for the most part, done a great job. There are, however, instances in which iPhone X users are still reporting problems such as poor battery life as well as, phones not holding a charge. My iPhone X 256 is at 95% battery, but indicates “Service”. My apps when updating freeze the phone and sometimes an app just hangs up while on it, or scrolling through the apps will do the same. My wife’s did the same thing as mine with worse battery health. Oaw7nC.