Why are there black spots or small impurities on the battery cover of the Xiaomi 15 Ultra?

Question

Accepted Answer

If the Xiaomi 15 Ultra battery cover has black spots or small impurities, please refer to the following information:
1. To achieve a delicate appearance and a smooth tactile feel on the battery cover, a surface-spraying process is used. During this process, tiny dust particles in the air can result in small black spots on the surface.
2. Black spots or small impurities are purely cosmetic and do not affect the phone's structural integrity or functionality.
3. The phone undergoes strict professional inspections before leaving the factory, so you can use it with confidence.
4. For optimal care, avoid using abrasive materials when cleaning the battery cover, as this can affect the surface finish.
5. If you notice that black spots or impurities are excessive or significantly affect the appearance, please contact Xiaomi after-sales service for inspection or replacement.