If you use a Linux laptop and have not heard of PowerTop you really need to keep reading! This is a fantastic tool for extending your battery life written and published by Intel. I use it constantly on long flights and my battery lasts long enough for a cross-country flight.
Getting longer battery life out laptop PCs is the holy grail of mobile computing. Powertop is a Linux tool to eek out those precious minutes of battery life by eliminating unnecessary power wasting processes.