This is the Venom-Racing 8.4V 4200mAh NiMH Hump Battery Pack.

FEATURES:
Delivers maximum punch and run time for demanding R/C racers

INCLUDES:
Venom-Racing 7 cell 8.4V 4200mAh NiMH Hump Battery pack with Traxxas type connector

REQUIRES:
Charger capable of charging NiMH batteries, such as the Duratrax Intellipeak series or the Great Planes
Triton series

SPECS:
Length:  5.31" (135mm)
Width: 1.85" (47mm)
Thickness: 1.73" (44mm)
Weight: 17.01 oz (485g)