Hey guys. I just bought a macbook pro a couple weeks ago. When I bought it I was under the impression that the battery would last for 5 hours. Though I'm finding that it only lasts for 3. Is this normal? What are others getting out of their batteries? And it doesn't really matter what I'm doing. I can be online, working, etc. and still get the same 3 hours out of the battery. A little disappointing.