NOVELTY - An electronic device (100) includes a body (110), a battery compartment (120), a waterproof gasket (130), a push button (140), and a battery cover (150). The battery cover comprises oblique rib and grooves. When the battery cover is pushed towards one end of the battery compartment near the first end from the other end of the battery compartment near the second end, the oblique rib will interfere with the oblique engage surface for sealing the battery compartment. The clips are engaged with the grooves for securing the battery cover.    USE - Electronic device, e.g. personal digital assistants or mobile phones including smart phones.    ADVANTAGE - The electronic device has a battery cover waterproof structure which is obliquely sealed, thus reducing the space required for the battery cover waterproof structure.    DETAILED DESCRIPTION - An electronic device (100) comprises a body (110) having two ends, a battery compartment (120) disposed in the body, a waterproof gasket (130) disposed around outside of the battery compartment, a push button (140), and a battery cover (150) coupled to the body. The gasket comprises an oblique engage surface, and one end of the oblique engage surface near the first end is elevated higher than the other end of the oblique engage surface near the second end. The push button is disposed on the body and adjacent to one end of the battery compartment near the first end. The push button comprises clips. The battery cover is coupled to the body, and comprises an oblique rib arranged corresponding to the oblique engage surface, and one end of the oblique rib near the second end is elevated higher than the other end of the oblique rib near the first end. The battery cover further comprises grooves. When the battery cover is pushed towards one end of the battery compartment near the first end from the other end of the battery compartment near the second end, the oblique rib will interfere with the oblique engage surface for sealing the battery compartment. The waterproof gasket is disposed between the battery compartment and the battery cover, and the clips are engaged with the grooves for securing the battery cover.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic explosive diagram of an electronic device.    Electronic device (100)    Body (110)    Battery compartment (120)    Gasket (130)    Push button (140)    Battery cover (150)