Abstract: A battery stage module comprises a battery stage with a battery chamber and two conductive members. A plurality of screws are locked to the jumper contacts of a circuit board and clamps the battery stage module to the circuit board. Each conductive member comprises at least one first spring and a second spring wherein the first spring is in contact with poles of battery and the second spring is located on bottom of the battery stage and is penetrated by the screw. The second spring is forced to touch the jumper contacts of the circuit board when the battery stage module is fixed on the circuit board by screws.