A frameless battery cavity formed in a device enclosure retains a battery housing. Cantilever tabs on a battery end of a wall of the device housing have detents that forcibly engage the battery housing when the battery housing is fully inserted into the battery cavity. The detents are restrained from springing away from the battery housing when it is fully inserted by notches in a battery cover. The notches engage the detents after the battery has been fully inserted. The battery cover is secured in the opening to the battery cavity so that the detents are prevented from expanding away from the battery, and thus releasing the battery from the cavity, unless the cover is removed by a user. A guiding mechanism guides the battery housing into the cavity to facilitate electrical engagement of a connection between the battery housing and the device housing.