[Elecraft] Windows 8.1 tablet power

[Mark N2QT via Elecraft]

I bought a win 8.1 (not RT) tablet from Cowboom for $59, hoping to interface it using its
micro USB port.  However the USB port is the only way to provide power to the thing,
and battery life is such I'd like to leave it on charge while operating, while not losing the
USB port data functionality. 

The unit is sold by Best Buy under the Unbranded name. 

Anyone have luck powering such a tablet without losing the USB data capability?  

Mark. N2QT