I have a very bad habit of constantly leaving my mac charging. I like having it plugged into the power adapter when I am not using it. Unfortunately, just like all my ipods, my macbook's battery is less then optimal. My friend with the same macbook gets 5-6 hours of battery life. However, my computer gets 2 maybe 2 1/2. I am wondering what I can do about this? Thanks guys and gals!