Traxxas Power Cell Features:• Heavy-duty construction to withstand high-current output• Built with Traxxas High-Current Connectors for the most reliable and efficient power transfer• 12-gauge wires with flexible silicone insulation resist damage and allow easy installation• High-voltage, low-resistance cells deliver maximum run time and ‘punch’Traxxas Power Cell Battery Packs are optimized for free-flowing power and maximum punch with premium quality, low resistance cells; flexible, silicone-jacketed 12-gauge wire; heavy-duty welded tabs; and Traxxas' high-output, gold plated, high-current connectors. Precision assembly with individually wrapped cells and clear overwrap complete the package.Traxxas Series 4 Power Cells provide a great balance of price and run time. A powerful Traxxas 7-cell 8.4V pack is the most cost-effective way to instantly increase top speed by 5mph or more with no other modifications. Experience faster acceleration, faster top speeds, and Traxxas quality and support with the only batteries engineered for your Traxxas model.