If it is still not visible, go back to Taskbar settings and select and ensure Power is turned on there. What to Do If the Icon Is Still Missing (Troubleshooting)
Windows 10 allows you to control individual system icons directly. Open by pressing Windows Key + I . add battery icon to taskbar
Before diving into system settings, check the "hidden icons" menu. Sometimes, Windows moves icons off the main taskbar to save space. If it is still not visible, go back