Depending on the model and iOS version of your iPhone, after repair you may suddenly encounter an “Important Message” or “Unknown Part” warning from Apple, indicating an issue with your battery, display, camera, or other components.
Additionally, you may have noticed the “Unknown Part” label under the “Parts and Service History” section in Settings.
These alerts surface when a repair has been done on your iPhone, giving you insights on replaced components like batteries, screens, or cameras.
Though only an Apple Genius Bar or Apple Authorized Service Provider can change components without triggering these messages, it doesn’t mean your battery is faulty. It simply means a new battery (or camera or screen) has been installed, delivering the same top-notch performance as the original.
Rest assured, these messages won’t hinder your iPhone’s functionality. There will be an "Unknown Part" message in settings for 15 days. That's it.