Our growing army of rapidly depleting mobile devices are spawning all manner of methods to power them back up again. You got your standard car chargers, your solar powered varieties; there is even a charge-by-motion that will soon (someday) be available. It just makes sense that we can now also add a pen into the mix.
The One Battery Mobile Charger Pen supplies one AA battery worth of external juice. Attach pen to phone, let it charge and you (apparently) got yourself 20 hours of stand-by time or two hours of talk time.
Five different adapters are included, and yes the pen works. Since the pen is bigger than most cell phones it seems a bit awkward to carry around, but it should make for a good thing to keep in a bag or backpack.