This is the Traxxas 6400mAh 11.1V 3C 25C LiPo with Auto Battery iD TRA2857X.

Features:

• iD Technology
• Semi rigid construction does not require a hard case and eliminates wire harness connectors that can loosen and fail
• Engineered specifically to fit Traxxas models
• 12AWG multi strand wire is soldered directly to the LiPo cells eliminating increased resistance from bullet connectors and accidental reversed polarity connections

Requires:

• EZ-Peak Plus 4-amp NiMH/LiPo Fast Charger with iD Auto Battery Identification
• LiPo charging bag

Specs:

• Configuration: 3S2P
• Continuous Discharge: 25C (160A)
• Max Burst Rate: 50C (320A)
• Watt Hours: 71.04
• Charge Rate: 1C (6.4A)
• Max Charge Rate: 2C (12.8A)
• Dimensions: 5.3 x 1.6 x 1.8″ (135 x 42 x 45mm)
• Weight: 17.1oz (485g)