A battery connector comprises a terminal block and a first and second terminal received in the terminal block. The terminal block comprises a base, a first protecting wall and a second protecting wall. The base, the first and second protecting wall together defines a receiving chamber. The first protecting wall defines at least a flange; the second protecting wall defines at least a resilient retaining arm relative to the flange. Under the cooperation of the flange and the resilient retaining arm, a reliable electrical connection is established between the first terminal, the second terminal and a coin battery.