This is the DuraTrax NiMH 6V 1600mAh Hump Receiver Battery Pack with Universal Connector.
FEATURES: 2/3A NiMH high discharge cells
Six welds per connection

INCLUDES: DuraTrax NiMH 6V 1600mAh Hump Receiver Battery Pack with Universal Connector

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

SPECS: Capacity: 1600mAh
Number of Cells in Series: 5
Rated Voltage: 6.0V
Min. Discharge Voltage: 4.5V
Lead: 20AWG 5.9" (150mm) long wire with Universal connector
Pack Dimensions: 51 x 30 x 32mm (2 x 1.2 x 1.3")
Weight: 124 g (4.4 oz)
Number of Welds Per Connection: 6