Smart battery provided with power source voltage management circuit

The utility model relates to a smart battery provided with a power source voltage management circuit. The smart battery (1) includes an electronic circuit (10) which is used for managing power source voltage and is connected with a battery (2); the electronic circuit includes a battery life termination detector (3), a management unit (7), an oscillator stage (4), a DC-DC converter (6) which is energized when the power source voltage of the battery (2) is approximate to or equal to a battery life termination threshold value, and a data or instruction communication interface (8), wherein the data or instruction communication interface (8) is a single-wire interface which is connected with positive pole power source voltage terminals of the smart battery and is used for transmitting modulated data or instruction signals through one of power source voltage terminals, wherein the modulated signals transmitted by the interface includes battery life termination information.