Abstract: The method of making standby water-activated primary current sources, according to the invention, resides in that concurrently with hermetical sealing of the ends and edges of the negative electrodes, a flanged rim is provided along the perimeter of each of the negative electrodes, the height of said flanged rim being in excess of the thickness of the bipolar electrode and the separator. The flanged rim forms an angle from 90.degree. to 180.degree. with the electrode surface and is provided with at least one shoulder for passing the water and gases and for current leadout. The bipolar electrodes are interlaid with the separators, whereupon the adjacent portions of the flanged rims are welded together into an integral block of bipolar electrodes. The proposed method makes it possible to completely dispense with manual labor and simplify the production techniques.