This is the Traxxas SERIES 4 4200mAh 8.4V 7C Flat NiMH with iD Technology TRA2940X.

Features:

• 12AWG multi strand wire is soldered directly to the LiPo cells eliminating increased resistance from bullet connectors and accidental reversed polarity connections
• 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

Requires:

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