An electronic cigarette battery assembly, including a charging electrode, the charging electrode including an inner electrode arranged on the inner rim thereof and having a spherical cap end face, and an outer electrode arranged outside the inner electrode and having a ring shape; the charging electrode and the rechargeable battery of the electronic cigarette being connected by means of a control module, when it is necessary to charge the rechargeable battery, one need only connect the charging electrode to the electric power output terminal of the external charger in order to charge the rechargeable battery. There is no need to remove the rechargeable battery, thus the invention is very convenient to use and solves the problems of existing electronic cigarettes, wherein it is inconvenient to remove a rechargeable battery for charging and the electrical connection is unreliable due to loosening of the battery.