iPhone 15 overheating during regular use and affecting battery health

Keep in mind that it’s normal for your iPhone to experience some heat. If you do not receive a temperature warning message, you can continue to use your iPhone normally.

Please try a force restart procedure in the meantime.

• Press and quickly release the volume up button.
• Press and quickly release the volume down button.
• Press and hold the side button until you see the Apple logo 

Force restart iPhone - Apple Support

Then review this following support article.

If your iPhone or iPad gets too hot or too cold - Apple Support

Lastly, make a reservation at your nearest Apple Store’s Genius Bar or Apple Authorized Service Provider for evaluation and diagnostics.

Genius Bar Reservation and Apple Support Options - Apple

Regarding your battery health, that should drop 1% per 50 charge cycles on average, but can decline faster based on many factors such as overheating.

“iPhone 15 overheating during regular use and affecting battery health“

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Troubleshooting an Overheating iPhone:

Did you Transfer Data?:

There are likely too many processes taking place. So, power off the phone, to let it cool, and then try clearing space. Have you recently filled you iPhone storage? Having low available storage can most certainly case overheating. process are likely taken up

Perform the following:

I. Cool Down the iPhone:

For a few hours, perform the following...

• Power Off: the iPhone for a bit
• Unplug: any Cables
• Place it Atop: a Laptop Cooler
• Keep it in: an open space
• Keep it Out of: direct sunlight

then...

2. Clear Space Using my User Tips:

See if you need to clear lots of space. System resources may be using up too much services, making it overheat. Internal storage cannot be upgraded. It is what it is. So, the maximum internal storage capacity never increases, even if you upgraded your iCloud plan. Learn More here: What's the Difference Between Device Storage and iCloud Storage? Apple Support

So, what to do...

Clear Space, Using my User Tips:

• How to Clear Space from your Mobile Device, and What to Clear: - User Tip
• How to Clear "Other" in your iPhone's Storage - Use Backup - User Tip

Any Corrosion?

I am wondering if it is a corrosive battery. Do you see any lumps on the iPhone? If so, it is corroding, and that makes this a health hazard. So, if corrosion is occurring, you should get this serviced, ASAP.

Contact Apple Support:

A. Contacting Apple Support:

• Contact Us - Choose Locations
• Proceed from there as necessary

B. Contacting an AASP:

Also, look into taking it to an AASP(Apple Authorized Service Provider) seeing if they offer service for this.

1. Go Here: Find Locations - Apple Authorized Reseller
2. Click: Service & Support
3. Enter: your location information
4. See: if there is an AASP nearby
5. Contact: an AASP that shows up, and find out more about the services that they offer to fix the iPhone

Bryant5799 wrote:

Thanks. I’m aware that it is normal for the phone to heat up. The problem is the battery health. You mentioned battery health drops 1% per 50 charge cycles. Yet mine drops without even being charged. The overheating is enough to drop my battery health without the charging factor and I don’t think it’s normal.

I think you should make an appointment for diagnostics and evaluation.

Bryant5799 wrote:

I know. The point is that my battery health drops a percent day by day because of overheating. It’s not normal.

That doesn’t sound normal then, please have your iPhone checked out with the link I provided above to make an appointment. What is the battery health at now?

“My battery health is decreasing day by day.”

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Unfortunately, there is no way to determine why, nor when, the Battery Health decreased.