The rumored battery life of the iPhone 17 Pro Max is expected to be significantly improved compared to its predecessors and other top smartphones. Leaks suggest that it could feature a larger battery, thanks to an increased thickness of 8.725mm, up from 8.25mm in the iPhone 16 Pro Max[1][5][6]. This increase in thickness is believed to accommodate a larger battery, potentially enhancing the device's battery life[5][6].
Some rumors even point to the iPhone 17 Pro Max achieving over 40 hours of battery life, thanks to next-generation carbon battery technology and an A19 Pro chip, which would make it one of the longest-lasting iPhones ever[2]. If true, this would surpass the battery life of many current top smartphones.
For comparison, the iPhone 16 Pro Max, currently one of the best iPhones for battery life, offers around 17 hours and 35 minutes of usage[1][3]. Other top smartphones like the Asus ROG Phone 9 Pro and OnePlus 13 achieve battery life of approximately 20:34 hours and 19:45 hours, respectively[3]. The Samsung Galaxy S25 Ultra and Moto G Power 2025 also offer impressive battery life, with times around 17 hours and 14 minutes and over 17 hours, respectively[3].
If the iPhone 17 Pro Max achieves the rumored 40+ hours of battery life, it would not only outperform its predecessors but also become one of the top smartphones in terms of battery longevity, potentially surpassing competitors like the Asus ROG series and OnePlus models[2][3]. However, these are just rumors, and actual performance may vary once the device is released.
Citations:
[1] https://www.yahoo.com/tech/iphone-17-pro-max-rumor-175719296.html
[2] https://www.youtube.com/watch?v=HwSnJz5UqxQ
[3] https://www.tomsguide.com/us/smartphones-best-battery-life,review-2857.html
[4] https://reboxed.co/blogs/outsidethebox/the-best-iphones-for-battery-life-ranked-reboxed
[5] https://www.macrumors.com/2025/03/07/iphone-17-pro-max-thicker-larger-battery/
[6] https://bgr.com/tech/ultra-thin-iphone-17-air-may-launch-alongside-apples-thickest-ever-pro-max-model/
[7] https://www.businessinsider.com/guides/tech/best-phone-battery-life
[8] https://appleinsider.com/articles/25/03/07/iphone-17-pro-may-get-thicker-than-the-iphone-16-pro
[9] https://www.whathifi.com/advice/iphone-17-release-date-rumours-price-leaks-possible-specs-and-features