Thank you for your feedback. The increased power consumption while watching videos or playing music on the Xiaomi 15 is primarily due to the enhanced audiovisual experience that the device provides. Features such as high-quality display, powerful audio output, and continuous processing for media playback require more power to function smoothly. To help reduce battery consumption, you can consider lowering the volume or adjusting the screen brightness.
Additionally, if you're streaming content, using Wi-Fi instead of mobile data can also contribute to better battery life.