YOWOO Graphene Battery 3S 4000mAh 100C 11.1V Lipo Battery with XT60 / Deans T Plug for Traxxas 1/10 RC Car/Truck, Slash VXL,1/10 Rally, XO-1 Supercar, E-Maxx Brushless, E-Revo Brushless, Spartan. Aluminum plates are added around the graphene batteries to help prevent them from falling and colliding during transportation.