I have found this interesting
article that lists simple steps that one could follow to maximize Notebook battery life. These tips will allow you to remain unwired longer and enjoy the portability of your Notebook.
1. Make sure your notebook is set to Balanced or Power Saver mode
2. Disable wireless devices, blue tooth devices if they are not in use.
3. Use the lowest backscreen light setting that you find bearable
4. Stay away from using DVD's or CD's in your laptop while using battery power