Check out these universal notebook batteries that can power any laptop plus any USB peripherals including the iPod.
APC Universal Notebook Batteries provide your notebook computer with extra runtime from a single external battery pack. These batteries are lightweight and slim for maximum portability, perfect for situations when you won’t be near power outlets for extended periods of time, like on a plane, in a meeting or on the road. These Universal Notebook Batteries have selectable output voltages and come with a variety of notebook tips, making them compatible with most notebook computers. (See Compatibility Guide.) In addition to stand-alone use, these batteries are the perfect complement to the APC family of Notebook Cases and Universal Power Adapters. Together, these products give the mobile professional maximum availability to power no matter where you go.