I have both the four cell and the 6 cell batteries for my tx2000. With the four cell I barely get an hour off of it, my 6 cell has about an hour and a half of battery life. If I change my power settings to the lowest processor state, brightness, and if I have as few programs running as possible, my battery life doesn't increase by more than 10-15 min for either battery. I have had my 4 cell for about 7 months and my 6 cell for about 10 months (came with the computer). What can I do to increase my battery life? Or, is there something wrong with them? Should I try calibrating them? Won't that reduce the overall capacity?