Microsoft has revamped the clock and volume slider UIs on the Windows 10 system tray, which you can restore with a couple of registry edits. Windows 10 also has a revamped laptop battery UI on the system tray shown in the shot directly below. You can revert back to the battery UI from other Windows platforms by editing the registry as follows.
First, open the Registry Editor in Windows by pressing the Win + R hotkey and entering ‘regedit’ into Run. Alternatively, you could also edit the registry with some of the registry editors covered in this TechJunkie guide. Then go to this registry key HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\ImmersiveShell.
Select the Immersive Shell key on the left, and the right-click an empty space on the right of the window to open the context menu. Select New > DWORD (32-bit) Value from the context menu. Then erase the ‘New Value #1’ title of the new DWORD and replace it with ‘UseWin32BatteryFlyout’ as shown below.
Double-click UseWin32BatteryFlyout to open the window in the shot below. Enter 1 in the Value data text box. Click OK to close the window, and then you can also close the Registry Editor.
Now double-click the battery icon on your system tray. It will open the former battery UI fully restored in Windows 10 as below. Note that there’s some other difference between them besides the UI. For example, clicking More power options in the old battery UI will open battery settings in the Control Panel. The new Windows 10 battery UI opens extra options in the Settings app instead.
You can always revert back to the new Windows 10 battery UI by double-clicking UseWin32BatteryFlyout in the Registry Editor to open the Edit DWORD (32-bit) Value window again. Then enter 0 in the Value data text box and click OK. Alternatively, delete UseWin32BatteryFlyout by right-clicking it and selecting Delete.
So that’s how you can restore the battery UI from previous Windows platforms. Click here for further details on how to restore the former system tray clock. This TechJunkie article tells you how to get the previous volume slider back in Windows 10.