So Apple claim 5hr of battery life on the new Penryn 15" LED Macbook pro. Here's my first test on my brand new MBP (just in case anyone was interested). I forgot my power adapter this morning so I took the opportunity to write down a few numbers. Configuration. Wireless off, screen turn off 2min idle, screen dimmed down to about 75%. 8:00 - 9:00 (99% - 90%) - standby on commute. 9:30 - 10:30 (90% > 70%) - resumed it from standby - attached it to an external monitor and ran the calibration for it. - idle 10:30 - 10:45 (70% > 66%) - ran itunes, played music (no skipping). - disconnected the external because I though it was sucking up the juice. 10:45 - 11:30 (66% > 40%) - viewed and edited a couple pictures on Lightroom - imported and viewed photos on iPhoto - ran vmware to check something in windows for about 5 min. Shut it down afterwards. - played with settings because isight was not working 11:30 - 12:00 (40% > 30%) - idle. Nothing running. Screen turned off. 12:00 - 12:30 (30% > 17%) - itunes playing music (no skipping). - tried to fix isight problems by looking in system profiles, settings, etc. (it would not work. Opened photobooth and got the camera with a line diagonally across it). 12:30 - 12:40 (17% > 12%) - shut down and restarted - isight works now so I played with it a little (5min). Took 4 pictures. - itunes playing music (no skipping). 12:40 - 1:00 (12% > 6%) - itunes playing music (no skipping) - looking through system settings for battery information 1:00 - 1:10 (6% > 2%) - idle. Nothing running. - kept the screen on to see what's going on my moving the mouse every so often. 1:15 (0%) - MBP goes to sleep. This is the first time using the battery. It's been connected to power source 100% of the time since I got the machine last week. Overall, it's 3hr 45min of usage. It's nowhere near 5hrs that Apple claims (with wireless on) but not bad. My last laptop gave me 1:45 min max with the screen dimmed down to the lowest setting.