This is a system component. If you are missing the settings menu, it is likely due to a botched system update. Installing an older or newer APK version of this specific system app ( PowerKeeper ) manually can cause system instability, bootloops, or battery drain because it is deeply integrated with the Android system framework.
It identifies and restricts power-hungry apps that shouldn't be running. battery and performance xiaomi apk
Xiaomi devices aggressively throttle (slow down) the CPU when the battery hits 42°C. This is a system component