This is a Traxxas 2S "Power Cell" 25C Lipo Battery with iD Traxxas Connector, a certified iD-Equipped LiPo battery that is engineered to provide the punch and on-demand power for reaching the top speeds that Traxxas models are built to achieve. Traxxas Power Cell iD-Equipped LiPo batteries are engineered specifically to fit Traxxas models and maximize their full performance potential. Traxxas delivers you more of what you want most: simple installation, a great price, and extended speed and run time.