This is the Traxxas 4000mAh 11.1V 3C 25C LiPo with Auto Battery iD TRA2849X.

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

Specs

• Type: LiPo
• Total Capacity: 4000 mAh
• Voltage: 11.1V
• C Rating: 25
• Length: 5.31 in. (135mm)
• Height: 1.02 in. (26mm)
• Width: 1.69 in. (43mm)
• Weight: 11.1 oz. (315g)

Requires

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