A portable electronic device (101) includes a battery cover (200), a latch (200) and a housing (300). The battery cover has a resisting portion (114). One end of the latch has a limiting portion (207), another end of the latch having an engaging portion (208). The housing has a positioning portion. The latch moveably engages with the housing, and the resisting portion of the cover locks with the engaging portion for releasably locking the battery cover. The limiting portion engages with the positioning portion so as to limit the cover to open relative to the housing. This release provides a user with convenient and easy to use disassembly mechanism for the device.