Maria Calfa-DePaul has been responding to comments in the original post about powering a USB keyboard with the Duracell Powerhouse.
The main question on everyone's mind has been, "How long will this thing actually last?" The answer seems to be quite a while... or at least longer than a fully charged iPhone will!
Okay this now has exceeded my expectations. I used the charger for 1 and a half hours the first time. Then tonight without recharging it I used it for 3 hours straight and guess what? it's still 3/4 charged. The green light is only slightly diminished!! and my iphone died!! (and it was fully charged when I began!) so...keep posted folks cause this is SWEET!!
We're probably looking at 10-12 hours of use on a single charge! Not bad!
As a bonus, all this tinkering lead Maria to producing a new track using Animoog and NanoStudio.