[Xiaomi Mi 11] Asnamus:
PLEASE READ CAREFULLY

Now this is just my personal preference and you don't need to follow all steps and you should choose what suits your needs. But I get amazing battery life with this settings without sacrificing 120Hz and WQHD+.

I am on EU ROM 12.6 21.3.31 Beta Latest Update

With 120Hz and WQHD+ Turned ON.

If you use WQHD+ Uncheck save battery with WQHD+ (if enabled this will make screen glitch while switching across apps)

I uninstalled a lot of apps but the most important that drain battery are Facebook and Chrome.

ADB COMMANDS:

adb devices

adb shell

pm uninstall -k --user 0 com.mi.globalbrowser (MIUI browser)

pm uninstall -k --user 0 com.google.android.googlequicksearchbox (Google)

pm uninstall -k --user 0 com.android.hotwordenrollment.xgoogle (Google Assistant)

pm uninstall -k --user 0 com.android.hotwordenrollment.okgoogle (Google Assistant)

pm uninstall -k --user 0 com.mi.health (MIUI Health)

pm uninstall -k --user 0 com.google.ar.lens (Google Lens)

pm uninstall -k --user 0 com.android.email (Mail)

pm uninstall -k --user 0 com.android.mms (Messaging)

pm uninstall -k --user 0 com.xiaomi.payment (Mi Coin)

pm uninstall -k --user 0 com.miui.videoplayer (Mi Video)

pm uninstall -k --user 0 com.miui.player (Music)

pm uninstall -k --user 0 com.miui.notes (Notes)

pm uninstall -k --user 0 com.miui.huanji (Mi Mover)

pm uninstall -k --user 0 com.miui.weather2 (Weather)

pm uninstall -k --user 0 com.miui.personalassistant (MIUI app vault)

pm uninstall -k --user 0 com.xiaomi.migameservice (Mi Game Service)

pm uninstall -k --user 0 com.android.protips (Home Screen Tips)

pm uninstall -k --user 0 com.xiaomi.mi_connect_service (Mi Connect)

pm uninstall -k --user 0 com.android.nfc (This will remove NFC)

pm uninstall -k --user 0 com.android.cellbroadcastreceiver (https://stackoverflow.com/questions/5296987/what-is-broadcastreceiver-and-when-we-use-it)

pm uninstall -k --user 0 com.google.android.apps.cloudprint (Cloud Print)

pm uninstall -k --user 0 com.miui.mishare.connectivity (Mi Share)

pm uninstall -k --user 0 com.google.android.gms.location.history (Google Location History)

pm uninstall -k --user 0 com.android.wallpaper.livepicker (Live Wallpaper Picker)

pm uninstall -k --user 0 com.miui.newmidrive (Mi Drive)

pm uninstall -k --user 0 com.xiaomi.macro (MiMacro)

pm uninstall -k --user 0 com.miui.nextpay (NextPay)

pm uninstall -k --user 0 com.mfashiongallery.emag (Mi Wallpaper Carousel)

pm uninstall -k --user 0 com.miui.android.fashiongallery (Wallpaper Carousel)

I am sure I uninstalled more google apps and forget to write it down.

Settings/Apps/Permissions/AutoStart -Here you can leave ON only apps like messenger Viber WhatsApp Gmail and apps that you think you need to receive notifications at all the time. But turn off all the rest.

Settings/Apps/Manage Apps/Battery Saver/Restrict Background Activity -Here you choose which apps should be restricted, I have restricted most of my apps except the ones that need to get messages and notifications etc...

ADB COMMANDS

adb devices

adb shell

pm disable-user com.android.traceur (Disable logcat if you don't need logs)

cmd package bg-dexopt-job (Forcing ANdroid app optimization after every update (must be redone after every OTA) but also automatically runs every X days when the cell phone is charged overnight)

Settings/Location/Wi-Fi and Bluetooth Scanning -Switch Off Both Options-

Settings/Connection And Sharing/Printing -Switch Off-

Settings/Connection And Sharing/Private DNS/Private DNS Provider Hostname/DNS.Adguard.com

Settings/Wi-Fi/Wi-Fi Assistant -Switch Off Everything-

Settings/Bluetooth/Additional Settings/Pair Compatible Devices -Switch Off-

Settings/Additional Settings/Developer Options/Window Animation Scale -Off-

Settings/Additional Settings/Developer Options/Transition Animation Scale -Off-

Settings/Additional Settings/Developer Options/Animator Duration Scale -Off-

Settings/Display/Dark Mode -ON-

Settings/Display/Reading Mode -ON-

Settings/Display/AI Image Engine -All OFF-

Settings/Location/Google Location History/Pause

Settings/Always-On Display & Lock Screen/Always-On Display -OFF-

Settings/Always-On Display & Lock Screen/Notification Effect/None

Settings/Always-On Display & Lock Screen/Raise To Wake -OFF-

Settings/Always-On Display & Lock Screen/Double Tap To Wake Or Turn Off The Screen -OFF-

Settings/Password & Security/Fingerprint Unlock -OFF- (Face unlock is just blazing fast and best option)

Google Play/Settings/Auto-Update Apps/Don't Auto-Update Apps

There is a ton of settings in the phone so I could left something out but these are for sure the main important ones.

And necessary to tweak this device all the time ,. Revert some of these settings after every restart.