This is the Great Planes 2-Pin (also known as a JST connector) Charge Adaptor. It comes with banana plugs on one end of the adaptor so that it will work with most chargers. These work great, and save you the hassle of making your own charge lead.
Includes: One 2-Pin/Banana Plug Charge Adapter
Specifications: Length: 3.5" (89mm) (overall tip to tip)