Windows 10 is playing catchup with other mobile operating systems, report Windows Report, with a new feature available in Skip Ahead builds.
They report that Windows 10 RS 5 (in particular build 17639 available in Skip Ahead) will now show you the battery life of selected Bluetooth accessories such as the Surface Pen in settings.
Not all devices are supported, but this would finally bring the OS on par with what has been available on iOS for some years now.
Hopefully, Microsoft will also be surfacing the battery level in a more visible location, such as in the Action Centre where other Bluetooth connections are usually on display.
Insiders can test this feature already by downloading the latest Skip Ahead build.