iPhone 13Pro Battery Draining

iPhone batteries degrade based on usage/ charging cycles. The more you use your device, the more you have to charge it, and therefore the faster it degrades. There sometimes can be an issue with either software or hardware that can cause batteries to drain or degrade at a high pace. You are on the right track though. Apple's engineers will have the advisor pull logs from your device and take some screen shots and screen recordings and review those to see what is causing the drain.

Usually it's something on the user end though. Not saying that's you, but that's usually the case. A game or program is usually the culprit, or something in the settings.

Toggle off things such as Wifi, Bluetooth, and Location Services when you are not using them. These features can drain your battery quickly, especially if they are constantly searching for a signal. Cellular drains your battery faster than anything, so when possible turn off cellular data and use wifi only.

Check for apps that are utilizing too much of the battery: Go to Settings / Battery and view which apps are using the most battery. If you notice any apps that are using a lot of battery in the background, you can try disabling their background activity or uninstalling them if you don't use them frequently.

Keep your device up to date on software for the best battery performance.

iPhone Battery and Performance - Apple Support

About the battery and performance of iPhone 11 and later - Apple Support

If your iPhone or iPad is running slow - Apple Support

I’m having same problem with my iphone 11 since last 4 days I just fully charged and left over all night and the battery was below 25% in the morning and the battery health is 100%. Even I turned off app background refresh and location. Can anyone figure it out whats the reason behind the battery draining.

Hello!

I was wondering how you fared with the encrypted backup and restore process?

If you’re not sure how to go about it, please see:

The links to do this appear below:

Link for how to Back up and Restore: Back up and restore your iPhone, iPad, or iPod touch to your Mac or to iCloud - Apple Support

Link for putting iPhone in DFU Mode: If you can't update or restore your iPhone or iPod touch - Apple Support

Note: The above material is not my work. Any credit should go to Michael Brooks1  who originally posted it here: Jun 27, 2023 8:55 AM in response to Jubalub. 

Please report back wether performing the above process made the battery drainage worse, fixed it, or if you noticed no change at all. 

I take it you are on iOS 16.5. I’ve read other places if you don’t have an Apple Watch deleting the fitness app has helped. And a last resort factory reset the device and set up as a new phone.