Traxxas Certified iD-Equipped LiPO batteries provide the punch and power to reach maximum speed. They come in a full range of capacities and configurations. Traxxas iD-Equipped LiPO batteries are engineered to fit Traxxas models perfectly and maximize their potential. Only Traxxas gives you more of what you want: simple installation, a great price, and the most speed and run time available. The patented Traxxas High-Current connector is the standard for efficiency, ease of use, and high-current handling. The balance leads are integrated into the connector eliminating separate balance wires and connectors as well as external balance boards. The Traxxas High-Current Connector allows current to flow freely with virtually zero voltage loss due to resistance. Large, textured surfaces provide good grip and the reverse-polarity protection makes them virtually impossible to plug in backwards. Shrouded wire connections eliminate the need for heat shrink tubing. Beefy, gold-plated copper terminals with large, spring-loaded contact areas ensure a perfect connection every time. Traxxas iD-Equipped Power Cell LiPO packs use a unique construction that results in a firm, rugged, and compact pack that does not require a hard case. This gives them greater capacity and allows the user to monitor the condition of the battery. Unlike a hard-cased pack, if a Power Cell LiPO "puffs" or softens due to damage or abuse, the user can easily see and feel the change in the pack.