iOS 18.6 and iPhone battery overheating

What do you have showing for your Battery Health at Settings > Battery > Battery Health & Charging > Maximum Capacity? If it is under 80%, then you will need to have it replaced. I can't imagine any iPhone 11 that would still be operating normally on the original battery where it has not been replaced no matter what iOS version you have installed.

It is normal to have your phone heat up for several days after an update, sometimes a week depending on your Photo Library size. This is due to Spotlight indexing of the newly installed files and any new Object Detection algorithms being run on your Photos in the background. Most users experience that after every update, although it would be much more noticeable on a battery that is close to failing.

It's not always the iOS update's fault!  Many things can cause phone problems.  If you tell people you think it's an iOS update, it might make it harder to fix or find a solution for the real issue.

Remember, the right question often leads to the solution!

Was/Is your device Jailbroken? If that's the situation, please be informed that attributing the issues to iOS updates may not be accurate.

iOS updates aim to enhance user experience, boost security, and fix bugs rather than disrupt core features. The majority of the issues after updates might stem from underlying, unmentioned factors. Updates won't typically alter personal data but may refine settings or features. Backup before major updates for safety. Review Apple's update details and backup advice for a smooth process.

Kindly consider checking your settings and addressing any device issues before attributing the issue to external factors. This could be a pure coincidence that the iOS update affected the iPhone functions.

Before initiating a standard iOS update, it's advisable to create a backup. Have you completed this step? If yes, proceed with the restoration from the backup.

See what each update does: About iOS 18 Updates, About iOS 17 Updates, About iOS 16 Updates, About iOS 15 Updates, About iOS 14 Updates, About iOS 13 Updates, About iOS 12 Updates, and so on...

It surely is not iOS 18.6 because...

I conducted a thorough search of this forum using the term 'battery drain after iOS update' and uncovered numerous posts detailing similar issues across various iOS updates. This suggests that iOS updates may not consistently be the root cause. Below are a handful of examples extracted from the search results:

• iPhone 14 Pro Max battery drain after iOS 17.0.1 update
• iPhone 6s battery drain after iOS update 15.7.1
• Re: Battery draining quickly on my iPhone 13 after iOS 18.5 update
• Battery Drain rate after iOS 16 update
• My iPhone 13 battery is draining fast after iOS 18.3.2 update
• Battery Draining after the ios 16.5 update
• Battery Draining after updating iOS 18.1.1
• Re: Battery drain after ios 15.6 update
• battery drain after ios 10 update
• Re: iPhone battery drain after updating to iOS 16.3

What I did is given below

1. Took a backup on iCloud (Which I do regularly)
2. Logged out of the Apple ID
3. Erase --> Erase iPhone - Apple Support (IN)
   1. Keep eSIM Data was the option I chose (See the pic)
   2. .
4. Set up my iPhone and restored it from iCloud Backup
5. 

I continued to have the same issue with the heating.

I repeated the above steps but this time I did not restore from the iCloud Backup. I set it up as a new iPhone.

Waited for 3 days. There is no heating issue, now.

Conclusion.:

• There is no hardware issue!
• This is not an iOS 16.0.3 issue
• Some Apps or iPhone storage and some settings may be heating up the device.

Action Plan:

• I will now slowly get my all data back one by one.
• Using the elimination process I will try to find out which app or settings were causing this...

Now the heating issue isn't there anymore. I am adding apps one by one and keeping tab on the heating issue.

My experience says this is purely caused by some third-party app that you may have installed.

I am not aware of the ambient temperature in which you are using the iPhone. However --> Keeping iPhone, iPad, and iPod touch within acceptable ...

Store the device where the temperature is between -20º and 45º C (-4º to 113º F). Don’t leave the device in your car, because temperatures in parked cars can exceed this range.

Use iOS devices where the ambient temperature is between 0º and 35º C (32º to 95º F). Low- or high-temperature conditions might cause the device to change its behavior to regulate its temperature. Using an iOS device in very cold conditions outside of its operating range might temporarily shorten battery life and could cause the device to turn off. Battery life will return to normal when you bring the device back to higher ambient temperatures. Using an iOS device in very hot conditions can permanently shorten battery life.

It surely is not after iOS 18.6 because...

I conducted a thorough search of this forum and uncovered numerous posts detailing similar issues across various iOS updates. This suggests that iOS updates may not consistently be the root cause. Below are a handful of examples extracted from the search results:

The links I've found suggest that the reason for battery drain may not be solely due to iOS updates, but rather, it could be influenced by how an iPhone is utilized.

• Re: Is the heating issue on iPhone resolved with iOS 17.0.3 Update?
• Overheating problem on my iPhone since updating to iOS 17
• Re: ios 17 over heating
• updated to ios 16. now my phone is overheating
• Re: Iphone 11 IOS 16.3.1 Burning hot
• Iphone 12 overheating
• Re: why is my iphone xs overheating?
• My iPhone 7 overheated
• My iPhone 11 overheating
• After 16.3 update my device is overheating I’m just open safari and watch YouTube video after some minutes my device is starting to heats 😔...
• new i pad 12inch overheating nearly all the time
• Hi, i have the new iphone 14 for a month now. Still 100% battery heatlh but my question is, why is my iphone turning off and showing that its overheating even tho im only charging it or playing a game without any other games in the background? And when it turns off it comes back on and shuts down again and repeats ir for about 20 minutes. and when i turn on hotspot after 5 minutes it shuts off the phone again. maybe its because of a water damage issue? Because before 3 days i poured water...

I have this same issue on my iPhone 11. The entire time I’ve owned this phone and through all the updates over the years, it has never heated up like it’s doing right now after the 18.6 update I did 2 days ago. I think Apple is trying to kill my phone off so I’ll buy a new one. Kidding but not kidding.

I recently updated to iOS 18.6.1, then powered it off for about a half-hour and it’s been running cool ever since.

I know you recently swapped the battery.

I’m not going to lecture you on the battery like others love to do.

All the best! 👋🏼😉

You said that a new battery was installed a few months ago. Fair to say 3-4 months is a "few"?

Absolute Worst Case, the Battery Health on your phone at this time would be at 97-98%, yet you report it as 86%.

So far, it looks like you have a serious battery or other hardware problem which is creating the problems. If you are going to blame this on iOS 18.6, you will need to know what the Battery Health was 2 weeks ago.....before....you installed iOS 18.6.

Do you have that information?

As far as "overheating", are you saying that an "overheating" message is appearing on your iPhone and the iPhone has to back off and cool before you can continue?

If you are not seeing an "overheating" message, the phone is not overheating.

There's really not much else that we can suggest. If the phone really is overheating, then you will need to take it back in for service and ask about the very fast Battery Health drop as well.

I have a 13 pro that does the exact same thing since 18.6 update. Apple doesn’t seem to do much about it either. Every time I plug it in it gets very warm and it didn’t do that before prior to 18.6 update.

Slightly Frustrated wrote:

I have a 13 pro that does the exact same thing since 18.6 update. Apple doesn’t seem to do much about it either. Every time I plug it in it gets very warm and it didn’t do that before prior to 18.6 update.

Your iPhone 13 is likely due for a battery replacement whether you installed the update or not. What are you showing for Battery Health at Settings > Battery > Battery Health > Maximum Capacity.

Battery is at 86%. As I mentioned before, I have never experienced my phone heating up until I updated to 18.6.

Bob Timmons. You are combining my comments with the original poster. The original poster did not say their battery was at 86%, I did, Daisy Designer

Are you saying that an "overheating" message is appearing on your screen telling you that the iPhone must shut down to cool off before things can continue?