Check out newest versions at the sourceforge download site: http://www.sourceforge.net/projects/kbatt/
To install download the tarball, unpack it, and then:
You can also open the KDevelop project file, and make the compilation there.
While running on battery mode, you will be able to see the battery status, charge percent, and remaining time of your battery.
If you have AC power connected, you will see a connector symbol. If your battery charges, a flash also appears.
Click the applet to change the display between remaining time and charge level.
If you have no batteries, this is all you see. KBatt is designed for laptops! :-))