This is the Traxxas 3000mAh 8.4V 7C Hump NiMH with iD Technology.

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:

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

Specs:

• Length: 155mm (6.10″)
• Width: 48mm (6″)
• Height: 42mm (1.7″)
• Charge Rate: 3A