Thanks for the welcome. I spoke to Microsoft, and they said as far as they know it doesn't exist, but they couldn't go very far, because all their access to sites selling non-Microsoft technology is blocked.
Woah woah woah. Please speak regular human to me. I have no previous computer experience and lost you past USB. But yea I have a battery pack that I would just like to be able to charge my sp3 with. The battery pack only has USB ports. Thanks for all your responses!!
Has anyone found a charging cable that has a USB on the other end? I have a portable charger with USB ports only and I'm looking all over, haven't found anything yet.