I bought my Macbook Pro 13" about a week ago and it said that i should have 7-8 hours of battery life but i only get about 4-5 hours when fully charged. The only thing i know is that this was an issue for everyone updated to Lion. My only concern is that i updated my Macbook to 10.7.2 and it still didn't fix it. So what can i do to get my Macbook to the full 7-8 hours for school? The 4-5 hours won't cut it and its really disappointing.