Mobile phone battery and mobile phone with the same

The utility model discloses a mobile phone battery which comprises an iron cell and a power conversion device; wherein, the power conversion device comprises a first pair of terminals, a second pair of terminals, a switching control circuit and a DC power voltage conversion controller which are connected in series between the first pair of terminals and the second pair of terminals, and a protector which comprises three ports; the first port is connected with the anode connecting ends of the first pair of terminals, the second port is connected with the anode connecting ends of the second pair of terminals, and the third port is connected with the DC power voltage conversion controller; and the iron cell is connected with the first pair of terminals connected with the switching control circuit. By controlling the output voltage of the mobile phone iron cell by the power conversion device, voltage boosting and reduction voltage circuits used in the mobile phone iron cell are integrated in one power conversion