This is the 7.2V NiMH 1200mAh Power Series 1 Battery Pack from Traxxas.
FEATURES: Used in the 1/16 scale Traxxas Slash and E-Revo VXL
New high current connector with gold-plated copper terminals and
iD Auto Battery Identification allows Traxxas iD equipped chargers to
automatically set and optimize charge settings for specific battery
MAXX cable high-efficiency 16 gauge silicone jacketed wire
INCLUDES: One 7.2V NiMH Power Series Battery Pack with Traxxas High-Current
REQUIRES: Peak-detecting charger rated for NiMH batteries
SPECS: Length: 94mm (3.7")
Width: 34mm (1.3")
Height: 17mm (0.67")
Weight: 5.1oz (145g)
BOX DIMENSIONS: 1.88" W. X 1.13" H. X 4.38" L.
BOX WEIGHT: .35 LBS.