Well yeah, they'll use less power, certainly. If you're opting for the 4-cell battery (which doesn't give very long as it is), the 7,200RPM is going to cut down battery life even more. I've got a 5,400RPM drive in mine and the LED display, and battery life is fairly decent. Don't know what difference the CCFL display makes on battery life though; the 1330 I had before it had the CCFL display but a 6-cell battery.