The author of YouTube Geek Abhishek has organized a comparative test, in which he compared the autonomy of iPhone 17 and iPhone 17 Pro Max with leading devices of competitors.

The test used Samsung Galaxy S25 and S25 Ultra, OnePlus 13, IQOO 13 and Google Pixel 9 Pro XL. It is noteworthy that all these models are equipped with battery capacity larger than Apple's smartphone.
For the objectivity of testing on all devices, similar conditions have been placed. Smartphones have done similar tasks: Play videos, photography and game start.
The first person to complete the work of the Galaxy S25 Ultra (7 hours 02 minutes), iPhone 16 (7:10) and Galaxy S25 (7:14) have turned off behind it. The new iPhone 17 lasts 7 hours 33 minutes, losing a little OnePlus 13 (7:34) and iPhone 16 Pro Max (7:38).
On the average results displayed by Google Pixel 9 Pro XL – 7 H 49 minutes and IQOO 13 has shown 8 hours 41 hours impressive. The leader of the test is the iPhone 17 Pro Max, working for 8 hours 57 minutes, nearly an hour higher than the nearest competitors.
The test results are confirmed by: The autonomy of smartphones depends not only on the battery capacity, but also on the optimization of the software and energy efficiency of the components. For example: IQOO has 13 batteries for 6150 mAh, while at iPhone 17 Pro Max – 4832 or 5088 mAh, depending on the version.