A battery connector is disclosed. The battery connector is disposed in a mounting side of a motherboard, and an input/output port is positioned on the mounting side for inserting outer connectors. Wherein, the electric connector includes a connector body having a battery accommodating space for accommodating the battery. The connector body is located on the mounting side and the input/output port is positioned on the mounting side. The computer case has a slot near the input/output port, and the slot is disposed corresponding to the battery accommodating space.