This is the 7.2V 3300mAh Stick Battery Pack from Traxxas.

FEATURES: 12-gauge wire
          Heavy-duty welded tabs
          High-output, gold plated, high-current connectors

INCLUDES: One 7.2V 3300mAh NiMH Stick Battery Pack with Traxxas Female Plug

REQUIRES: A peak-detecting charger rated for NiMH batteries

SPECS:    Length: 135mm (5")
          Width: 47mm (1.9")
          Height: 25mm (0.98")
          Charge Rate: 3A