Abstract: A method and an arrangement for anticipating a disengagement moment of a battery package of a battery-operated electric device, and a battery-operated electric device. First identification members (9) of the disengagement moment of the battery package are arranged in a latch (3) of the battery package such that when the latch (3) is moved in order to disengage the battery package, warning information is generated from a housing of the device on the battery package being about to disengage from the housing of the device. In a preferred embodiment, the first identification members (9) are integrated into a spring element (7) of the latch (3). In another preferred embodiment, at least part of the latch (3) is made of an electrically conductive material and the first identification members (9) are integrated into the electrically conductive part of the latch (3).

Abstract: A mobile device (20) in which, in order to make the device thinner, at least one of the walls belonging to its structure (23, 26) has for a part of its area been made of thin plastic foil in order to reduce the thickness of the device. The same plastic foil also facilitates the printing of the product markings on it, e.g. by using laser-marking, prior to fixing the plastic foil in place.