Power for arducopter

I'm planning to order one of the arducopter kits:

3DR ArduCopter Quad-C Frame + Motors + Full Flight Electronics Kit

http://store.diydrones.com/3DR_ArduCopter_Quad_C_Full_flight_electronics_kit_p/kt-ac3dr-03.htm

but as far as I can tell, I would need to

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