The invention provides a battery protection circuit, which is connected between a battery and a communication module, and is composed of a FET tube stack and a protective resistor R1 which are sequentially connected with one end of the battery; a battery protection IC which is in parallel connection with the sequentially connected FET tube stack and protective resistor R1, the battery protection IC is used to detect the voltage UFET between two ends of the sequentially connected FET tube stack and protective resistor R1, when the UFET is bigger than the basic voltage U0 of the battery protection IC, the FET tube stack is closed; and a capacitor C1 which is in parallel connection at both ends of the battery protection IC, the charging time at the network searching function startup of a mobile phone communication module is longer than the network searching startup time, and during the network searching, the voltage UFET is smaller than the basic voltage U0 of the battery protection IC. Adopting the battery protection circuit provided by the invention, the battery output current can be improved; making the two modules of a dual-mode mobile phone can be started at the same time for the network searching, thereby saving starting time. The battery protection circuit of the invention also provides a dual-mode mobile phone using the battery protection circuit.