You can try Battery Status 0.1

Battery Status is a project for GNOME, that shows information about laptop battery state. It has some additional features, so usual icon of GNOME Power Manager can be removed from Notification/Indicator Area. Battery Status doesn't rely on GNOME Power Manager directly, but counting on presence in system for some useful integration with it.

Features:

Using the Battery Status applet, the user can access:

• Battery Status dialog


• Power Statistics (provided by GNOME Power Manager)


• "Show" setting


• CPU frequency scaling (provided by gnome-applets/cpufreq-applet)


• Power Management preferences (provided by GNOME Power Manager)

Add the ppa ppa:iaz/battery-status to your software sources (here's how to do that) and install battery-status from the software center .

You can run it as an indicator using the following command:

/usr/lib/battery-status/battery-status --indicator