I think the 5v on the RC can supply 1 amp, that is shared by all of the devices in or plugged in to the RC.
Quote:
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+5V Power Pin - The total combined current supplied from all 16 Analog and 18 Digital +5V Power header pins is 1 Amp. The 1 Amp max can come from a single +5V Power pin.
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http://www.ifirobotics.com/rc.shtml#Specifications