https://pbs.twimg.com/media/BIEHzjDCMAEpTNZ.jpg:large

I design electronics for a living, so these boards caught my attention.

The green board has some round corner notches. (Those are to avoid the screw posts in a rectangular enclosure.) While not exactly unusual, they ARE distinctive.

I'm guessing they are some kind of remote control electronics from a place like ebay, especially since the battery used (https://pbs.twimg.com/media/BIEKumUCcAA6KtF.jpg:large)probably came from ebay: http://www.ebay.com/itm/Tenergy-8-4V-5000mAh-Flat-NiMH-Battery-RC-Car-Traxxas-/330516737294

The green pcb looks similar, but not exactly like an E-flite Blade CP (RC helicopter)- so I'm guessing it's a different model from E-flite.

https://www.google.com/search?q=blade%20cp%20pcb&psj=1&bav=on.2,or.r_cp.r_qf.&bvm=bv.45368065,d.aWc&biw=1868&bih=995&um=1&ie=UTF-8&hl=en&tbm=isch&source=og&sa=N&tab=wi&ei=vchuUeT8IMWzygHIiYCAAw