The 3500 mAh 2-cell LiPo battery delivers maximum punch and long runtimes for your Mini Maxx. Traxxas Certified iD-Equipped LiPo batteries provide the on-demand power to reach the top speeds that Traxxas models are built to deliver. Traxxas exclusive iD battery system is the easier and safer way to charge your Traxxas batteries. Only Traxxas gives you more of what you want most: simple installation, a great price, and the most speed and run time available.