This is a Traxxas "Series 3" 3300mAh, 7 Cell Stick Pack with a installed Traxxas Connector.

Traxxas models are known for unmatched speed and acceleration; now there's a line of batteries you can count on to deliver all the performance that’s been engineered into your Traxxas models. 

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 attractive, individually wrapped cells and clear overwrap complete the package. 

Traxxas Series 3 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 the top speed by 5mph or more with no other modifications. The 7-cell hump pack fits in all Traxxas models except E-Maxx® and E-Revo®. Both the 7-cell stick pack and the 7-cell hump pack fit in Slash. 

Experience faster acceleration, faster top speeds, and Traxxas quality and support with the only batteries engineered for your Traxxas model.

Features:

• Heavy-duty construction to withstand high-current output
• Built with Traxxas High-Current Connectors for the most reliable and efficient power transfer
• 12-guage wires with flexible silicone insulation resist damage and allow easy installation
• High-voltage, low resistance cells deliver maximum run time and punch