Battery stick of electronic cigarette

A battery stick of an electronic cigarette, characterized in that:

• the battery stick comprises an outer tube having a closed end and an opening end, and a connecting sleeve, wherein a battery is disposed inside the outer tube, an air inlet aperture is provided in a wall of the outer tube, an inner wall of the opening end of the outer tube is sleeved on an outer wall of the connecting sleeve, an inner wall of one end of the connecting sleeve corresponding to the opening end of the outer tube is sleeved on and connected with an outer electrode, an inner wall of the other end of the connecting sleeve is sleeved on and mounted with an air flow switch, a sealing component for the air flow switch and a circuit board, the outer electrode is arranged with connecting means, an inner electrode is arranged inside the outer electrode, and an insulation sleeve is arranged between the inner electrode and the outer electrode to separate them from each other, the sealing component for the air flow switch and the circuit board are successively mounted in the connecting sleeve, the air flow switch is mounted inside the sealing component for the air flow switch, a notch which is rectangular in cross section is formed in a wall of the connecting sleeve at a position where the circuit board is mounted, a protruding and extending part is arranged at a circumferential edge of the circuit board and correspondingly engaged with the notch, and a bulge is arranged on an inner wall of one end of the connecting sleeve which is arranged with the notch, so as to retain the circuit board.