I got my retina the other day and had a whopping 3:15 battery life. :[ I let it die and then recharged it, even though it's not a nickel cadmium batt., i know this doesn't affect it. Still for around 3:30. I turned off auto-brightness, and the battery life shot up to 4:45. Apple estimates a 7 hour battery life. Is there anything else I can do in System Pref. or in running apps or anything else to increase the battery life a little more? I run the screen at about 50% brightness. I could go lower, but 50% is comfortable.