Developing cartridge

A developing cartridge, detachably mounted on a drum cartridge including a photosensitive drum, the developing cartridge comprising:

• a casing configured to accommodate developer therein, the casing having a first side and a second side arranged oppositely in a first direction, and a third side and a fourth side arranged oppositely in a second direction, the first direction and the second direction intersecting;
• a developing roller rotatable about a first axis extending in the first direction, the developing roller being positioned at the third side, and the developing roller contacting the photosensitive drum;
• a coupling rotatable about a second axis extending in the first direction, the coupling being positioned at the first side;
• a storage medium including an electrical contact surface, the electrical contact surface being positioned at the first side;
• a separation member being positioned at the second side, the separation member receiving a separation force to cause the second side to move in a direction away from the photosensitive drum;
• and
• an abutting member positioned at the first side, the abutting member being able to contact with an external component to cause the first side to swing away from the photosensitive drum.