http://www.cyberpowersystems.com/CPH420MP.asp , available on Amazon
There seem to be battery powered usb hubs ** *"Hub 420 MP* The latest product innovation from CyberPower Systems provides you with the ability to easily connect and power up to four USB devices without an ac power adapter. The new Mobile Battery Powered USB 2.0 4-port hub features rechargeable batteries to power the hub." Ideally, a double hub only would be better, but this product seems to be the only one ( http://jrandomhacker.info/Sharp_Zaurus_SL-series/accessories#USB_Devices )
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