In MacOS Big Sur, you can show the battery percentage in the [Dock & Menu Bar] settings.

In MacOS Big Sur, the battery in the menu bar has the percentage turned off by default.

How to

  1. Open then System Preferences… 
  2. Open Dock & Menu Bar.
  3. Under Other Modules section, select Battery.
  4. Here you can configure: 
    • Show in Menu Bar
    • Show in Control Center
    • Show Percentage

    Upload file