[RC-Monster Mike]

It is true that you can use a receiver pack in addition to the BEC according to the instructions. The instructions ALSO state that the bec is only rated for 12 cells. So...if you have over 12 cells, you shouldn't technically be using the controller's BEC at all(with or without "assistance"). Under 12 cells, and you can use a receiver pack for "help". It really only makes sense to run a receiver pack AND the controller's BEC when using 6 or 7 cells. 18 cells using the controller's BEC is asking for it, as the controllers BEC unit must "dupmp off" the extra voltage(20+ volts input vbs. 5.5volt output = 15+ volts worth of extra energy to dissipate) as heat.