Windows 10 very recently added a panel for checking the battery percentage for Bluetooth devices. This panel leaves a lot to be desired. It is exceptionally restricted so that you do not get the battery percentage for most devices. Exceptionally common devices like the Surface pen, or a pair of Beats headsets will make the cut but little else will. More info at https://www.addictivetips.com/windows-tips/view-battery-percentage-for-bluetooth-devices-windows-10/

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