From a couple of weeks ago, I'm playing with Oneiric. but in oneiric, due to the combination of gtk2/gtk3, sometimes it lost important indicators... XD
So I've tried to revive inidcator for battery named "indicator-power-gtk2". yeah it based similar name indicator-power gtk3 indicator.
Today I could make it land on unity-2d gtk2 panel...
and from this menu, we could kick gtk3 "power settings" tools and/or so... but unfortunately sometimes unstable especially when the toggle "show time remaining" on, crash it... X( damned.