- You cannot add "YOWOO 4S Graphene Battery 14.8V 5000mAh 100C RC Battery with XT90 Plug for Mikado LOGO500 Align T-REX550 600 GAUI X5 Outrage 550 Hirobo SDX FPV Heli RC Quadcopter Airplane Traxxas RC Car Truck Boat" to the cart because the product is out of stock.