Active Level 3
The battery backup getting worst after updating Samsung Note 10 Plus Software to Android 11.0.

Before update the battery backup was appx 22 hours which got reduced to 10-12 hour only after update without usage.
Active Level 6
go to service center and reinstall last firmware...I have faced same issue but now solved. phone working normal...
have you downgrade to lower android version?
no downgrade my friend...just reinstall the latest firmware via samsung center...
If after update then wait for few days, and as of now perform these below steps;

A. Wipe Cache Partition.

Steps to perform.

1) Turn off the device.

(Connect with type C cable and connect withpc/laptop only for Android 11 )

2) Press and hold the Volume Up key and the spower button.
3) When the Android logo displays, release all keys.
4) Press the Volume down key to navigate and select "Wipe cache partition".
5) Press Power key to select. When the wipe cache partition is complete, Select Reboot System.
6) Press the Power key to restart the device.

B. Reset App Preferences.
Settings >Apps> Tap on Top Right 3Dots and select Reset App preferences.

C. Go to settings >general Management >reset>reset settings.
furtherif you not done yet then do some settings to save more battery life and observe for next 1-2 days, it will give a noticeable difference

1. Settings>Connection>more connections settings> disable nearby device settings.

2. Settings>>Location>improve accuracy >disable
A. Wifi scanning
B. Bluetooth scanning .

3. Device care>battery >power mode>select "optimised" and "adaptive power saving".

And then click on "app power management >
And enable these 2 options.
A. Adaptive battery
B. Put Unused Apps to Sleep.

A. DEVICE CARE > Battery>Background Uses Limit > Put Unused App to Sleep
B. Device Care > Battery> More Battery Settings>Adaptive Battery

4. Long press on each app specially 3rd party app(LIKE FACEBOOK, YOUTUBE) and rarely used apps and also ON "GOOGLE APP" as well, then click on>app info> go to these 3 options below on by one

A. Mobile data> allow background data usage>off

B. Battery >allow background activity >off

C. Notification >disable unnecessary notifications like promotional and unnecessary reminder notifications.

5. Go to settings> privacy > permission manager > location> and check which app have accessing your location all the time and if you not using that apps much, then deny access or set as " allowed only while in use"
As unnecessary location access by 3rd party app causing battery drain.

6.  Go to settings > Google > on device sharing> check which 3rd party apps present there for e.g. if you use paytm , paytm will  shared data to show recommendation and suggestion which also cause battery drain

7.  Go to settings > account and backup> Manage account > check which app syncing automatically there, and if any app which not necessary to auto sync then click on it and "disable sync"

8. Go to settings >apps>search "weather" >click on weather settings (icon)> change "auto refresh" settings as per your requirements and disable some unnecessary reminder. ( due to auto refresh it continuously consuming battery)

9. If you use Facebook frequently then disable "auto play video"
And if you are mostly uses mobile, on wifi connection then also disable "auto play videos" in YouTube.

10. Settings>Google >click on 3dot at right top corner>usage and diagnostics >off this option.
I have a note 10+ too, and even after update I am getting around 7 hours of SOT. And that's quite awesome.
I think you updated your phone with Mobile data, So I would request you to update your phone with Smart switch on PC or Laptop.
If not available visit nearby service centre to update/reflash your phone and your issue will be resolved.

If that helped or solved your query "Accept as solution" will be appreciated.
Beginner Level 2
after update in m31 battery backup reduce 18-24 hours

Dear Samsung Member,

Greetings from Samsung Customer Support!

To resolve your device battery drain issue please visit this link:

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Warm Regards,
Samsung Customer Support