Sorry If I'm wrong* but I still don't know of any standard whereby the slave USB device can power the host i.e.
you cannot charge a pandora (or suchlike) using the full-size USB A port
hosts (with A sockets or B plugs) source power
slaves (with B sockets or A plugs) sink it
the exception is miniAB which can act as either host or slave depending on weather you use a miniA or miniB plug
*I was! See below - there are new fancy ways to do it
				
			you cannot charge a pandora (or suchlike) using the full-size USB A port
hosts (with A sockets or B plugs) source power
slaves (with B sockets or A plugs) sink it
the exception is miniAB which can act as either host or slave depending on weather you use a miniA or miniB plug
*I was! See below - there are new fancy ways to do it
			
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