Abstract: A battery module including a battery frame, a plurality of locking structures, a plurality of battery units, and a plurality of lug structures is provided. The battery frame is provided with an accommodating space. The battery frame includes a first portion extending along a first direction and a second portion extending along a second direction. The first direction is different from the second direction. The locking structures are disposed on the battery frame. At least one of the plurality of locking structures is disposed on an outer side of each of the first portion and the second portion. The battery units are disposed in the accommodating space. Each of the lug structures includes a lock portion configured to detachably engage with one of the locking structures.

Abstract: A rotation apparatus comprises a sleeve, a retaining means, a first base, a second base, a pivot and a pivot base. The sleeve passes through the first base and the second base and screws into the retaining means. The pivot is fixed onto the second base and the pivot base is coupled to the pivot. After mounting a display panel to a host body via the rotation apparatus, the display panel can be flipped open via the pivot/pivot base linkage and then rotated around the axis of the sleeve. Furthermore, the components constituting the rotation apparatus are easy to manufacture and assemble.

Abstract: A two-sided engaging device for engaging frames of a portable device is provided. The two-sided engaging device for engaging frames of a portable device includes a main body disposed on a first frame of the portable device; an engaging element connected to the main body and having two hooks and at least one pillar; wherein the hooks are respectively positioned at an upper side and a lower side of the engaging element; and a switch having at least one Z-shaped guiding groove for guiding the pillar passing therethrough so as to switch a position of the engaging element.

Abstract: A rotation apparatus comprises a sleeve, a retaining means, a first base, a second base, a pivot and a pivot base. The sleeve passes through the first base and the second base and screws into the retaining means. The pivot is fixed onto the second base and the pivot base is coupled to the pivot. After mounting a display panel to a host body via the rotation apparatus, the display panel can be flipped open via the pivot/pivot base linkage and then rotated around the axis of the sleeve. Furthermore, the components constituting the rotation apparatus are easy to manufacture and assemble.