Lithium Polymer batteries can be very dangerous. Assuming these make it from china hobby line to South Carolina in one piece, who’s to say if they’ll even work? They’re arguably the most important part of any aircraft, and I don’t know why you’d want to risk that on a no-name brand to save about $5. If you want cheap, just go to HobbyKing (their USA warehouse) and look at the Turnigy and Zippy batteries. They’re decent and have a reasonable reputation.