The Black box on the left is the optional AstroFlight Whatt Meter. I am using Radio Shack Molex connectors for model RC cars that use a 7.4 volt battery.
Note the 7.4 volt set they sell uses heavier wire than the 9.4 volt set.
The Whatt meter is held in place with Black Velcro purchased in the paint department of Home Depot. If it is no longer needed, just remove it and connect the Male and Female Molex connectors left behind in the Electrical box.
See "Options" album for details on the Whatt Meter.