Needless to say, conserving your battery power is the most important task when you are on the move with your laptop. Other than disabling all unused programs by shutting down them during the startup, one of the great way to save battery power is to reduce the running frequency of your CPU. The slower frequency the CPU runs, the less power it consumes.

In your Ubuntu, you can easily switch your CPU frequency via the CPU Frequency Scaling Monitor Gnome-applets.