The one test that stood out more than anything else, though, was battery life. The batteries themselves didn’t change, nor did the Leopard operating system. Apple didn’t invent some great new power-management utility. The improved battery life is a direct result of the Penryn CPU’s deeper sleep states and its more energy-efficient processor core. The new MacBook Pro produced 3 hours 56 minutes on MobileMark 2007 tests, which is a significant jump from the 3 hours 10 minutes of the previous-generation MacBook Pro. That’s about a 15 percent improvement, which should be music to the ears of road warriors.