System icons can vanish from the Windows taskbar due to a few common triggers:
: Right-click an empty space on the taskbar and select Taskbar settings . Scroll down to the Notification area and click Turn system icons on or off . Locate the Power icon and toggle it to On . add battery icon to taskbar
If Windows’ own battery meter is unreliable, consider or BatteryInfoView . These add a highly customizable battery icon and percentage to the taskbar with more detailed stats. System icons can vanish from the Windows taskbar