[Russ Beavis]

I'm not sure that I understand the question.

In FTC, an NXT brick is the primary controller and it includes a set of internal batteries. I understand that a breakout adapter is available for driving additional motors. Does that breakout adapter use a separate battery? I'm guessing that it does but I'm not 100% positive.

In FRC, an NXT controller brick should be legal since it's COTS and < $400. However, it can't be used to directly drive any motors and there isn't a really easy way to connect it to the primary FRC controller (the National Instruments cRIO system). One thing's for certain - any batteries from FTC can NOT be used in FRC since the only battery that is allowed on the robot is the MK battery from the kit-of-parts.

Does this help answer your question?

Russ