An uninterruptible power supply (UPS) module unit including a storage battery; a unit case to contain the storage battery; a conductive terminal electrically connected to the storage battery, and disposed in the unit case; and an electrode connector partly inserted from the unit case into a hole formed in the conductive terminal, and electrically connecting the conductive terminal to an external device, wherein a slot is formed in the unit case so as to correspond to the conductive terminal and the electrode connector, wherein rotation of the electrode connector is prevented and the electrode connector is not separated from the unit case.