Hi I tried searching for an 'average' battery life for macbooks. One person said that s/he has 3 hours max on their macbook. my lappy operates for about 3.5 hours unplugged. this is way better than the dead battery on my old laptop, but i believe i read that the macbooks are suppose to run for 6 hours on battery. So, i'm a little disappointed. But would other macbook owners be kind enough to throw in their battery life to help me guage the severity of my disappointment? thanks.