An electronic device includes a first cover, a double sided pressure sensitive adhesive (PSA) tape, a battery, and a second cover. The second cover is attached to the first cover. The battery is arranged between the first cover and the second cover. The second cover defines a groove. A shape of the groove is substantially same as a shape of the PSA tape. The PSA tape covers the groove. Thereby the PSA tape and the groove cooperatively form an air flowing channel having an inlet and an outlet. The battery is fixed to the second cover by the PSA tape. An adhesive force of the PSA tape applied between the battery and the second cover is decreasable by flowing air with temperature greater than a preset value through the air flowing channel so as to enable the battery to detach from the second cover.