Power via USB port?

Can you power a G3 clamshell SE 466MHz via its USB port? I know the port provides power out to attached devices, but doesn't the USB standard also call for allowing power to flow into the iBook? Is it enough to run it?
I want to get a big external battery pack, and one of the power options is a USB connection.
Thanks for any help/ideas/experiences you all can offer!

Being that the iBooks only have USB 1.1, and that 1.1 is a very low powered Bus, I doubt it. I'd suggest asking the manufacturers of this battery pack about it, or maybe even dropping us a link to the page you found the battery on.

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