battery drain and heating issue big sur 11.4

1. Update the software on your Mac, if one available.

    Update may come with bug fixes.

    https://support.apple.com/en-us/HT201541

2. If your Mac battery runs out of charge quickly

3. Startup in Safe Mode. https://support.apple.com/guide/mac-help/start-up-your-mac-in-safe-mode-mh21245/mac.  

    Quote:

    It also does a basic check of your startup disk, similar to using First Aid in Disk Utility. 

    And it deletes some system caches, including font caches and 

    the kernel cache, which are automatically created again as needed.

4. Battery Management.

   How battery health management helps

   https://support.apple.com/en-us/HT211094?cid=mc-ols-energy_saver-article_ht211094-macos_ui-04022020