A battery connector designed for being mounted on a circuit board, the circuit board being provided with a first conductive portion, a second conductive portion and a third conductive portion, and an indicating member being electrically connected between the first conductive portion and the third conductive portion, and further designed to electrically connect a button battery, the battery connector comprising: an insulating housing comprising a bottom wall, a plurality of elastic side walls which respectively connect with the bottom wall and a plurality of protruding blocks, each protruding block protruding from the corresponding elastic side wall at a position adjacent to the top of the corresponding elastic side wall, being spaced apart from the bottom wall and facing the bottom wall, the bottom wall, the plurality of elastic side walls and the plurality of protruding blocks cooperating with each other to define a limiting space for receiving and fixing the button battery; a positive terminal fixed to the insulating housing, the positive terminal comprising a positive contact portion which extends into the limiting space designed such, that it may contact a positive electrode on a side surface of the button battery and a first tail portion which extends out of the insulating housing designed such, that it may maintain an electrical connection with the first conductive portion of the circuit board; and a negative terminal fixed to the insulating housing, the negative terminal comprising a negative contact portion which extends into the limiting space designed such, that it may contact a negative electrode on a bottom surface of the button battery, a second tail portion which extends out of the insulating housing designed such, that it may maintain an electrical connection with the second conductive portion of the circuit board and a connection portion which is brought to move by the negative contact portion designed such, that it may electrically connect with the third conductive portion when the button battery is received in the limiting space, wherein the connection portion is further designed such, that by electrically connecting with the third conductive portion, the indicating member is being electrified to generate an indication signal. an insulating housing comprising a bottom wall, a plurality of elastic side walls which respectively connect with the bottom wall and a plurality of protruding blocks, each protruding block protruding from the corresponding elastic side wall at a position adjacent to the top of the corresponding elastic side wall, being spaced apart from the bottom wall and facing the bottom wall, the bottom wall, the plurality of elastic side walls and the plurality of protruding blocks cooperating with each other to define a limiting space for receiving and fixing the button battery; a positive terminal fixed to the insulating housing, the positive terminal comprising a positive contact portion which extends into the limiting space designed such, that it may contact a positive electrode on a side surface of the button battery and a first tail portion which extends out of the insulating housing designed such, that it may maintain an electrical connection with the first conductive portion of the circuit board; and a negative terminal fixed to the insulating housing, the negative terminal comprising a negative contact portion which extends into the limiting space designed such, that it may contact a negative electrode on a bottom surface of the button battery, a second tail portion which extends out of the insulating housing designed such, that it may maintain an electrical connection with the second conductive portion of the circuit board and a connection portion which is brought to move by the negative contact portion designed such, that it may electrically connect with the third conductive portion when the button battery is received in the limiting space, wherein the connection portion is further designed such, that by electrically connecting with the third conductive portion, the indicating member is being electrified to generate an indication signal.