USB Host Power Injector suggestion
 

This looks like a great portable option:
http://www.buy.com/retail/searchresu...play=&dclksa=1

APC has one too, but it's twice the price. Lenmar has a '1700' version, too, for a few bucks less. I assume that's the current in milliamps. (this one is a 2100) I don't know what the APC puts out.

Re: USB Host Power Injector suggestion
 

I have the APC battery, although I'm not sure exactly how the setup is supposed to be. I have a USB hub that has four USB ports, and one mini-USB port meant to connect to the host device. I assume I hook up the 770 to the mini-USB port, the APC battery to one USB port, and then another USB device I want to connect to any other USB port?