This is the Power Cell 5000mAh 14.8v 4-Cell 25C LiPo Battery for Traxxas.

Features:
Engineered Specifically to Fit Traxxas Models
High Current Connector with Gold-Plated Copper Terminals and Integrated LiPo Balance Charging Wires.
iD Auto Battery Identification Allows Traxxas iD Equipped Chargers to Automatically Set and Optimize Charge Settings for your Specific Battery.
MAXX Cable High-Efficiency 12 Gauge Silicone Jacketed Wire.
Fire Hazard if Used or Charged Improperly, Read and Follow All Manufacturer's Charging and Handling Instructions, Warnings, and Precautions Before Use.

Includes:

(1) LiPo Battery

Requires:
LiPo Compatible Charger
LiPo Charging Bag

Specs:
Type: LiPo
Total Capacity: 5000mAh
Voltage: 14.8V
C Rating: 25
Length: 155 mm
Height: 34 mm
Width: 45 mm
Weight: 16.8 oz

This product is compatible with the following Model(s): Traxxas X-Maxx,Traxxas Maxx,Traxxas Unlimited Desert Racer,Traxxas XRT