This is the Traxxas 14.8V 4S 6700mAh LiPo with ID Connector for use in the X-Maxx 8S trucks, or in the Unlimited Desert Racer for 4S power.
This is the Traxxas Unlimited Desert Racer 4WD Brushless Electric Off-Road Truck with Velineon VXL-6s Brushless Power System, TQi 2.4GHz radio system, and Traxxas Stability Management (TSM).