This is the Great Planes ElectriFly JST 2-Pin to Standard Connector Adapter.
Connects a battery having a Standard Male connector to an ESC or a
charger having a JST Male connector
One battery adapter
Length: 101mm (4")
Connector #1: Standard Female (Terminal Gender: Female)
(Housing Gender: Male)
Connector #2 JST Female (Terminal Gender: Female/Housing Gender Male)
Important Note: The gender of a plug is determined by the terminal
not the housing.