Sometimes, when I see something new, I have to smack myself in the head and think: "Why didn't I think of that?" Remember the old V8 Juice commercials? I just heard about one of these and It's the X-Power1 USB Rechargeable Battery Backup Cable from Xmultiple.
It looks like a USB charging cable swallowed a AA battery. What's inside is a lithium-ion battery with more capacity than built into any current iPhone or iPod. Using this cable, sync or charge your device while the internal cable battery charges. It will take about 3 hours to fully charge. Then when your device runs out of juice, plug in the cable and get power while you charge your device's battery.
I spoke with Alan Pocrass, the CEO of Xmultiple, and found that the information now circulating around the Internet is wrong. If you've already read something about the product, that information was based on a production prototype that will not be be built. The publicity picture is also inaccurate. The cable will work with iPhones, iPod touches and USB-charging iPods only, so earlier iPod owners (those that charge via Firewire) are out of luck.
Keep reading for more specifications...