If you’ve tried all the previous steps and your battery issues persist, it might be due to a rogue app consuming more power than it should. Fortunately, iOS provides tools to help you track down these misbehaving apps.

Go to Settings > Battery: Here, you’ll find a wealth of information, including Battery Usage By App. This section shows you which apps are using the most power.

Switch to Activity By App: By tapping on this, you can see a breakdown of how much power each app is using while on the screen and in the background.

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You can use this information to diagnose battery drain issues. Here are some other things you can use this information for:

• Identify Background Activity: If an app shows a lot of background activity compared to screen activity, it might be running excessively in the background. You can try disabling background activity for that app by going to Settings > General > Background App Refresh and turning it off for the problematic app.
• Spot Charging Issues: This data can also help you determine if your phone was actually charging when you thought it was.
• Detect Poor Battery Performance: Look for instances where the battery charge drops rapidly, which might indicate a problem.

These insights can help you diagnose and address battery drain issues effectively.