I recently purchased a powered 7-port USB hub and it has really made a difference in the performance of my WIFI dongle and stabilized the system. I am interested in using a Power Pack to run my Raspberry Pi so I don't have to have the wall wart tethered to an outlet.
The Power Pack has 2 USB ports, but the cable I was using on my previous hub has a different size barrel plug and will not fit your hub. Do you have a relatively short USB to barrel jack cable available for this?

