Stylus with Bluetooth top button is displayed as two separate devices in Power panel
Stylus with Bluetooth top button (more information) is displayed as two separate devices in Power panel - one always present Wacom device and another one appear when stylus is paired via Bluetooth. Moreover, in case of HP Active Pen G2 battery information coming from Bluetooth device seems like false - always 100% (while Wacom device report for example 25%).
I guess when support for such stylus devices will be in place it will logical to hide incorrect battery information from Power panel.