Princeton has unveiled its new PMP-BP18 battery pack for video iPod owners who need longer playback time. The battery pack provides significantly longer battery life for the iPod or any USB-equipped mobile device through its lithium-ion battery cells -- which Princeton estimates doubles the battery life for cellular phones with mobile TV support -- the BP18 includes an adjustable stand enabling users to rest the media player at a more natural angle for watching video at a desk or another stable surface. Princeton has not yet planned to ship the new battery pack to North America, however, according to Electronista.