Toner refill cartridge connected to main body through interface between development cartridge and main body

A development cartridge mountable in an image forming apparatus, the development cartridge comprising:

• a toner accommodating portion to accommodate toner;
• and
• a toner refilling portion, connectable to a toner refill cartridge via a communicating portion formed in an exterior surface of the main body of the image forming apparatus when the development cartridge is mounted in the image forming apparatus, to refill toner in the toner accommodating portion, the toner refilling portion including:
• a first connector to be electrically connected to the toner refill cartridge when the toner refill cartridge is connected to the toner refilling portion, and
• a second connector including a circuit unit to transmit information about the toner refill cartridge obtained through the first connector to a controller of the image forming apparatus, and to transmit information about the development cartridge obtained from the circuit unit to the controller.