Battery icon changed?

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)

Solution 1:

This bug has since been resolved.

When the charger is plugged:

When unplugged:

Solution 2:

Settings > Power - Show battery status in the menu bar = Never

oh, and i installed AwOken icon theme seems to have fixed the battery icon.