KThinkBat is a laptop battery monitor for the KDE-Kicker. It is inspired by the "Battery Maximizer" includes with IBM ThinkPads (now Levono).
KThinkBat uses the autotools. For a standard installation use
su -c 'make install'
You can use the ebuild at https://lepetitfou.dyndns.org/download/kthinkbat/kthinkbat-0.1.3.ebuild.