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Commit message: This was not tested. Though by viewing the file tree of /sys provided by @torwag here (file tree.txt line 3166) it seems that all methods are supported.
I didn't test whether this actually works on a rM 2 as I don't own that device. I'm confident though that it should work. I added the compiled demo binary that also reports that battery data. Please test whether it displays Charging/Discharging and the percentage on the reMarkable 2.