The X-Power 1 USB cord has a built-in rechargeable battery to give you a bit of backup power on the go (assuming you remember to take the cord with you). Their ad seems to imply more than that though.
The benefit of the X-Power 1 is that it's both a backup battery and a charger all in one and you don't have to deal with carrying around an extra gadget. The built-in rechargeable battery backup unit will be charged very time you connect your iPod or iPhone to your computer using the X-Power 1 and you'll get more quality time with your gadget:
- Additional talk time of 4.5 hours on 3G and 9 hours on 2G. Up to 5.4 hours additional on Wi-Fi.
- Standby time of up to 270 hours. Audio Playback up to 20 hours and Video Playback 6 hours.
Don't get me wrong, I'm all for extra time with my iPhone and less junk in my bag, but how the hell did that innocent USB cable result this: