XtremeMac has unveiled its unique MicroPack battery pack that's compatible with all Dock connector iPods.

The dual purpose gadget acts as both a battery top-up pack when on the move, and also as a Universal Dock when connected to a computer using USB.

It can provide up to 80 hours of audio playback time for the iPod nano, or eight hours of video-watching on an iPod with video.

MicroPack also offers dual headphone ports with independent volume controls so that two people can watch and share the same video and audio content at their own choice of volume.

The product ships in the US in spring 2006 where it costs $99.95. No UK details are available yet.