Abstract: A primary element is provided which is dischargeable at high temperatures comprising an alkaline electrolyte in a metallic annular cylindrical housing which encloses in inwardly directed concentric order: an outer positive silver oxide or manganese dioxide electrode in the form of a pressed powder cylinder and an inner negative electrode comprising a concentrically wound cadmium electrode wherein said negative electrode is separated from said positive electrode by a separator interposed therebetween. In storage and testing it has been shown that cells produced in accordance with the present invention may be kept at temperatures of the order of 200.degree. C. for over six weeks without any loss of operability.

Abstract: A plastic sealing member for sealing the housing cup of a round-type galvanic cell, and which is provided with a predetermined breaking point (bursting membrane or score) to prevent explosion of the cell during improper use, is covered on the surface which faces the inside of the cell with a pore-free film of bitumen, a synthetic resin, an adhesive, or a lacquer, at least over the predetermined breaking point and its immediate vicinity, to inhibit stress corrosion cracking which propagates under high mechanical stress and under the effect of the alkaline electrolyte, without reducing the intended bursting pressure.