The present invention provides an electronic cigarette and a battery device thereof. The battery device applied to an electronic cigarette, includes a cylindrical body, a first airflow channel, and two conductive members. The first air flowing channel extends axially through the cylindrical body. The conductive members are mounted to opposite ends of the cylindrical body, and keep insulation from an anode and a cathode of the battery device. The two conductive members further is electrically connected to each other. By virtue of the airflow channel defined in the cylindrical body of the battery device, it is easily to maintain the airflow channel being consistent, thereby enhancing the consistency of electronic cigarettes.