I have a Macbook Pro 2.16 Core Duo. The battery has been through 42 cycles and is showing as 98% health. I have also recently calibrated it. My problem is that even with only a web browser open and the display brightness on the lowest setting, the OS always reports the battery life as 3 hours or less. I have checked for abnornal cpu usage, and there doesn't seem to be anything happening there of note. Is 3 hours with the display that low normal? I'm aware that battery life is nowhere near the five hours advertised, but I would have expected a bit more from it than 3 hours at very dim display brightness. Can anyone help? What should I do?