This style of high-current connector is commonly used with the 7.2V sub-C battery packs that power many RC cars. The connector, sometimes called Tamiya or Kyosho, is keyed so that power cannot be reversed. A latch secures the connection so that it will not become disconnected.
This is the female version of the connector. Two 10cm 14-AWG wires are crimped inside the connector housing and extend 9cm past the plastic housing. The leads have silicone insulation and stripped, tinned terminations