Hi JisnuKalita. I'm Greg, 10 years awarded Windows MVP, specializing in Installation, Performance, Troubleshooting and Activation, here to help you.
Try the best available fixes here for Widgets and chat not working, battery drain in WIndows 11:
https://windowsreport.com/windows-11-widgets-no... (Avoid ad links which intrude into editorial copy, especially avoid Restoro and Reimage ads)
https://fossbytes.com/how-to-fix-widgets-not-wo...
https://www.elevenforum.com/t/microsoft-teams-c...
https://pletaura.com/microsoft-teams-chat-messa...
https://www.thewindowsclub.com/battery-drain-is... (Avoid ad links which intrude into editorial copy, especially avoid Restoro and Reimage ads)
https://windowsreport.com/windows-11-battery-dr... (Avoid ad links which intrude into editorial copy, especially avoid Restoro and Reimage ads)
https://www.youtube.com/watch?v=5UbyYXXymRg
https://www.youtube.com/watch?v=_s8ksEEu_Gw
The reason the battery issue was better in preview might be due to this:
https://www.pcmag.com/news/to-conserve-battery-...
If you are within 10 days of Upgrade you can still go back in Settings > Update & Security > Recovery > Go Back, and also in the Repair Mode here:
https://www.elevenforum.com/t/boot-to-advanced-...
I hope this helps. Feel free to ask back any questions. Please report back results for all steps given so I know what else to suggest if necessary.
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