The Kensington Ultra Portable Battery Pack

What a clever idea:

The Kensington Ultra Portable Battery Pack charges any device that can be powered using a USB cable. This includes all iPods, the iPhone, the Sony PSP and most current phones and smartphones. The device weighs just 3 ounces/84 grams and the internal power source contains Lithium-Polymer battery cells, not unlike the ones used in most high tech gadgets.

The battery pack can be charged through USB, which means you'll be able to fill it up from your desktop PC, laptop PC, the included USB wall charger, or any other device that has a powered USB port, including some airline seat power ports.

The internal batteries in the Kensington have a capacity of 1800mAH but feel free to forget that, because all you need to know is that the product has enough juice to power and recharge most gadgets at least 2 or 3 times.

According to the specifications provided by Kensington, you should be able to get the following out of the battery pack:

• iPod/Zune/Creative MP3 player : + 55 hours (of audio playback)
• iPod Video (5G/Classic) : + 14 hours (of video playback)
• Mobile Phone : + 5 hours of talk time / up to 4 days of standby time
• Smartphone (Blackberry/Palm/HTC): + 5 hours of talk time / up to 2 days of standby time
• PDA (Palm/HP/Dell): + 5 hours of use (when turned on)
• Portable gaming device (PSP, Game Boy/DS): + 5 hours of play time
  

The Kensington Ultra Portable Battery Pack costs $59.99 and is available here. Kensington provides a 2 year warranty on the product.