Get the latest tech news
Battery sizes revealed for Apple iPhone 17 lineup in new leak
The SIM tray makes a pretty big difference.
Besides the actual capacities, another interesting tidbit from the leak is the quite different capacities for variants of iPhone with and without a SIM card slot (which takes up some of the space inside the phone, thereby theoretically reducing available space for the battery). iPhone 17: 3,692mAh (just one figure is listed for this model, and it's unclear whether that's for the version with or without the SIM card slot) We'll see if Apple can offset that by using its own C1 modem in the iPhone 17 Air, which is another rumor we've heard about the upcoming device.
Or read this on Mashable