I bought a 15" i7 MBP few days ago. After fully charging it, it ran out of juice after 2.5 hours. Normal use (I know 'normal' can mean anything but it was just Safari- no videos - and Mail). I followed Apple's instructions and calibrated it (yes, I waited 5 hours after it fully drained from a full charge). With NO programs running (and dimmed to one up from dark screen), was showing 2:52 life. I took it back to Apple stors and they gave a new MBP... no argument. Can not complain about that. Now, my new new MBP is doing better but I am not sure I am getting the battery life I should. Again, full charge, NOTHING running, dimmed to one up from black screen: 4:46. Start Safari and it is under 3 hours. This is after proper calibration. I know 8-9 hours is more realistically 5-6 hours in real life but is what I am getting normal? I dropped by Apple store and I looked at an identical display machine... I pulled out the power connection for a few seconds and that unit showed over 8 hours of life... and it was running a few apps. Do I have another defective battery? Or does my expectation need to be calibrated? I am still within the 14 days so I can return the MBP but I was interested in any thoughts or experiences out there.