I've had my 4G ibook for 2.5 years and bought a new battery from newer tech a couple of weeks ago (since my original battery eventually couldn't hold a charge for more than a few minutes). I calibrated the battery several times as recommended, but am only getting a little over 3 hours unplugged. I distinctly remember getting 4 hours when I first bought my computer, and this new battery supposedly should be able to get at least that. I'm only running Firefox with the screen at half brightness. Is there something else I should have done or should be doing to get a better battery life? I've also noticed that it's been taking my computer a lot longer recently to complete simple tasks like opening a new tab or closing a program. I'm assuming that buying more memory would help with this?