This is the Venom Power 20C 4000mAh 11.1V LiPo Battery.

FEATURES:
For car usage
Traxxas type high current female connector
Balance connector

INCLUDES:
One Venom Power 20C 4000mAh 11.1V LiPo Battery

REQUIRES:
A charger with balancing capabilities
For a matching Traxxas type connector, the following are available; TRA3061 Traxxas Male Connector to
Molex Female Connector Adapter TRA3060 Male/Female Traxxas Connectors Plugs Only (No Wires)

SPECS:
Length: 5.3" (136mm)
Width:  1.8" (45mm)
Height: 0.94" (24mm)
Weight: 10.4oz (295g)
Lead Wire Size: 12 AWG
Lead Wire Length: 3.2" (82mm) approximate
Charge Rate: 4.0 Amps (1C)
Discharge Rate: 80 Amps
Max Volts Per Cell: 4.2V
Max Pack Voltage: 12.6V
Min. Discharge Volts: 9.0V

COMMENTS:
ALWAYS use a LiPo-approved charger
ALWAYS use a LiPo Cell Balancer
NEVER Charge over 4.20V per cell
NEVER Charge at currents greater than 1C
NEVER Charge through the "To ESC or "DISCHARGE" lead
NEVER Trickle Charge
NEVER allow to Discharge below 2.5V per cell
NEVER disassemble or modify pack wiring in any way or puncture cells
NEVER place on combustible materials or leave unattended during Charging
ALWAYS charge in a fireproof location
ALWAYS set charger's output volts to match battery volts
ALWAYS keep out of reach of children