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Ultra battery saver restricts all battery-consuming apps and functions on the Xiaomi smartphone to maximize the remaining battery.
In addition, the dark theme is enabled to reduce the battery consumption via the display.

Android 11 (MIUI 12.0)
Step 1: Tap on  Settings
Step 2: Tap on  Battery & performance
Step 3: Enable  Ultra battery saver
Step 4: Tap on  OK
  1. Tap on Settings
  2. Tap on Battery & performance
  3. Enable Ultra battery saver
  4. Tap on OK
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Xiaomi Instructions