New answers tagged icons
The applet for the Battery Monitor plugin does not use a simple icon. It draws a 2D vector graphic using the Cairo library. You can only edit the panel item's appearance within the limits provided by the plugin, which does not currently include an option for replacing it with an icon. It's normal that themes do not affect this panel item's appearance ...
I found a script that does exactly what i want on stackoverflow.com. http://stackoverflow.com/a/20703594
These changes to the systray js file may help https://github.com/linuxmint/Cinnamon/commit/d1a9cbd8dba2187230b0949b9b6d1e19cefe17e9 https://github.com/linuxmint/Cinnamon/commit/4aabc5a4944d9d7c864e47b971ca252431781ac0
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