I have had to replace my battery once in two years. There are a lot of rumors that talk about not letting you battery go totally dead while you computer is running, yet others that I have heard say that it's actually good for them to run dry once and a while. It's also interesting to note that right after I got my new battery, the life of my MBP was about 2 1/2 hours. Skip ahead three months and it's already down 1/2 hr. Does anyone have FACTS on giving your MBP battery the longest life possible? thanks all.