iPhone 17 Pro Max iPhone 17 Pro temperature

[Xutos]

Hi everyone,


I just got my iPhone 17 Pro Max and I’ve noticed some strange behavior. While setting it up (connected to the charger), it got really hot and even gave me a temperature warning. I don’t remember my old 16 Pro Max heating up this much. It also struggled to charge all the way to 100% — I even had to switch to a higher watt charger.

Today I noticed another issue: the battery percentage sometimes gets stuck at a certain point. After restarting the phone, it suddenly drops by about 5–6%.


Has anyone else experienced this? Do you think it’s just a software issue, or could it be hardware-related?

 

[zkap]

I'm guessing software - setting up, indexing etc. My iPhone will change the battery percentage by a few points after restarting, too. I don't own the new Pro.

 

[Jackbequickly]

Hi everyone,


I just got my iPhone 17 Pro Max and I’ve noticed some strange behavior. While setting it up (connected to the charger), it got really hot and even gave me a temperature warning. I don’t remember my old 16 Pro Max heating up this much. It also struggled to charge all the way to 100% — I even had to switch to a higher watt charger.

Today I noticed another issue: the battery percentage sometimes gets stuck at a certain point. After restarting the phone, it suddenly drops by about 5–6%.


Has anyone else experienced this? Do you think it’s just a software issue, or could it be hardware-related?

When setting up my 17PM yesterday via wireless phone to phone migration, the 17PM only got slightly warm during the process. Never hot. Less than 24 hours, my battery seems to be holding up well.

 

[jntdroid]

No issues for me so far - deep blue 17p 256gb. During couple of hours of iPhone restore and a decent amount of video last night it’s actually impressed me how it only got modestly warm.

 

[GrindedDown]

I’ve had the exact same issues as you from yesterday including a temperature warning. I just restarted my phone for the first time and indeed it dropped 5% battery instantly.

I think this is to be expected as the phone is syncing lots of data, the processor is running to install background apps, the os is indexing, and the battery is also calibrating. 2-3 days and it should all be much more normal feeling.

 

[Séamus Boyle]

17 pro 256gb here. I migrated using USB-C in both phones. Zero temp problems and I’m extremely impressed with how cool my phone is. My iPhone 15 pro since updating to OS26, my phone constantly couldn’t charge because of over heating. I’m talking wired and mag safe battery packs. The vapor cooling chamber is the ****!

 

[goldmac2006]

17 pro 256gb here. I migrated using USB-C in both phones. Zero temp problems and I’m extremely impressed with how cool my phone is. My iPhone 15 pro since updating to OS26, my phone constantly couldn’t charge because of over heating. I’m talking wired and mag safe battery packs. The vapor cooling chamber is the ****!

None of y’all think the vapour chamber cooling was kicking in when the iPhone experiences heat, right?

they should have added more heat sinks or even integrated vents into the speaker/mic array for ventilation. Just doesn’t make sense

 

[Séamus Boyle]

None of y’all think the vapour chamber cooling was kicking in when the iPhone experiences heat, right?

they should have added more heat sinks or even integrated vents into the speaker/mic array for ventilation. Just doesn’t make sense

Yes I think the vapor chamber was doing its job. That was the point of my post.

 

[goldmac2006]

Yes I think the vapor chamber was doing its job. That was the point of my post.

So, when I was learning about heat transfer in my physics class and during my NASA internships, I made this cool analogy based upon it: think of the heat from our iPhones creating convection currents. This heat activates the vapor chamber, which then releases deionized water from the surface-welded thermal cooling chamber. This water helps the heat from the chip dissipate away!

Hey, just wanted to share something interesting! The iPhone 17 Pro has a pretty cool thermal management system, with a -10 degree difference compared to other iPhone models. You can check out how it works in this article: https://9to5mac.com/2025/09/17/heres-how-the-iphone-17-pro-vapor-chamber-actually-works/

Also, did you know that ionised hydrogen and water chemistry play a big role in thermodynamics? Ion exchange is used to remove ionic compounds from boiler water used in steam generation for electric power. Ion exchange resins are also used to separate and purify various chemicals. Plus, they’re used to separate and purify rare earth elements from their ores. Pretty neat, right?

 

[thecautioners]

I’ve actually had no problems so far. 17PM stayed perfectly cool while being set up, and on Saturday I was doing some film/video out in the hot sun and the phone didn’t get hot or dim. I’m impressed!