SYPOM 1000mAh 35C 2S 7.4V LiPo Battery Pack with JST Plug Softcase for RC Model RC Hobby RC Car/RC Plane/DJI Quadcopter/RC Airplane/RC Helicopter Truck Boat(2 Packs)

found it at amazon.

I had a hard time finding this. don't know if it will help ya'!
and just thought of another main difference between the titan and the 50. the main shaft has two bolts holding the head where the 50 only uses one