I can assure you that the 9-10 hour estimate for the MBP is optimistic at best, and downright misleading at worst. I&#x27;m lucky to get 7 hours if I turn down the brightness and do nothing but browse the web and check email (no video or Outlook, just regular old Apple mail). Any realistic usage scenarios net about 4-5 hours, and any semi-intensive use (IDE open, iMovie, Photoshop, streaming video, etc) will drain the battery in 3.5 hours flat. I&#x27;m not the only person with these issues; Marco Arment, Gruber, and the rest of the Apple triumvirs all share the same complaints with regards to the 15&quot; MacBook Pro&#x27;s battery life. Part of the blame is poor optimization on Apple&#x27;s part with Turbo Boost, and another just rests on the fact that it&#x27;s ridiculously hard to drive a high-resolution, bright screen, a powerful processor, and a graphics unit without sacrificing some degree of efficiency.