This is the 7.2V NiMH Power Series 1 Battery Pack from Traxxas.
FEATURES: Used in the 1/16 scale Traxxas Slash and E-Revo VXL
Stick configuration
16-gauge wire
INCLUDES: One 7.2V NiMH Power Series Battery Pack with Traxxas High-Current
female connector
REQUIRES: Peak-detecting charger rated for NiMH batteries
SPECS: Length: 94mm (3.7?!?)
Width: 34mm (1.3?!?)
Height: 17mm (0.67?!?)