cool, but it's another thingy to carry and to have to remember in advance to charge.  I'll buy one when it's dime-sized, keeps itself continually fully charged by exposure to oxygen, and charges my device wirelessly (or even better, by clipping magnetically to my device).  Well by that point I assume the device's battery will itself have the former 2 qualities and a separate charger will therefore be unnecessary.  So, no thanks.