Is it possible to show the battery level of an RDP client inside the host?
I didn't find anything that would do this, either, so I started a new project on GitHub to create a Microsoft RDP client add-in for battery reporting.
Check the releases page for Windows binaries, if you prefer not to compile from the source, and follow the instructions for installation.
Disclaimer: I haven't used Windows in a long time, so I haven't tested this. That said, it should work.
Install 8gadgetpack to enable support to "Windows gadgets".
(Needed for Windows versions higher than 7)
Install the "Battery Meter" gadget.
- Activate the gadget, right-click and set it to "always on top".