A 9V Battery connector is used to hold 9V batteries on one side and on the other side, connector wires are plugged into the power supply unit to supply power to the whole circuit. Generally, we operate our robot in dc power supply. so connected the dc power source via a dc connector. One part of the connector is a connector of the development board and the other is connected to the dc power supply. DC power supply has two different connectors one is male and another is female, as the same type the 9V dc battery connector have also male and female connector which is connected to the battery and complete the circuit.