Abstract: A rechargeable battery set includes a power supply encased in a housing, a rescue alarm electrically connected to and powered by the battery via a switch so that when the switch is turned on, sounds of high decibels are generated and emitted by a speaker or buzzer incorporated inside the housing and a pair of retractable electrodes arranged within the housing to be electrically connected to the power supply via a high voltage generation circuit under the control of the switch and manually extendible out of the housing to provide an electric shock for user's body protection purpose. A flash generator is also mounted within the housing and connected to the power supply to generate a flash signal for rescue purpose.