I don't know what happened, but today when I logged in to Ubuntu 12.04, the battery icon looked strange (when unplugged):
When it's plugged, the icon looks as always been, the problem is when it's not plugged in:
I'm using ubuntu-mono-dark as the main theme, but trying to change the themes doesn't do anything, that "ugly" icon remains the same.
Any ideas if this is a bug or something? (or how to fix it)