This is the Traxxas SERIES 1 1200mAh 7.2V 6C Flat 2/3A NiMH with iD Technology.

Features:
iD Technology
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
Semi rigid construction does not require a hard case and eliminates wire harness connectors that can loosen and fail
Requires:
LiPo charging bag
EZ-Peak Plus 4-amp NiMH/LiPo Fast Charger with iD™ Auto Battery Identification
Battery Features:
Equipped with Traxxas iD Auto Battery Identification Technology
Engineered specifically to fit Traxxas models
MAXX cable high-efficiency 16-gauge silicone jacketed wire
New high-current connector with gold-plated copper terminals
Charger Features:
The Traxxas iD™ battery system is the easiest and safest way to charge your Traxxas batteries.
Automatically recognizes Traxxas iD batteries and in an instant configures and optimizes the charger settings.
The integrated balance connector on Traxxas LiPo iD batteries eliminates fragile balance wires and connectors, along with the need for external balance boards.
With the press of a button, the EZ-Peak Plus' Storage Mode protects your LiPo battery investment by safely preparing the batteries for extended storage.
4-amp fast charging and advanced high-resolution peak detection deliver a perfect charge every time.
Backed by the Traxxas Lifetime Electronics Warranty for years of reliable service.
Recognizes Traxxas iD batteries to automatically program and optimize charger settings
Charge progress indicator
Optimized for faster LiPo balance charging
One button LiPo storage charge protects your battery investment
Advanced high-resolution peak detection delivers a perfect charge
Easy to use interface
Built-in cooling fan
Advanced Mode for full manual control of charger settings
Legacy support for all Traxxas High-Current Connectors
Built-in balance ports for conventional LiPo batteries
Charges 5-8-cell NiMH batteries
Charges 2S and 3S LiPo batteries
Specs:
Length: 94mm (3.7")
Width: 34mm (1.3")
Height: 17mm (0.67")