Abstract: A prismatic Zn—AgO secondary twin cell battery includes: an outer cell case of prismatic shape, wherein the outer cell case has bottom surface and a top surface with a cell case cover, an electrode assembly housed inside the outer cell case. The electrode assembly is formed by stacking a positive electrode plate and a negative electrode plate covered with a separator. The cell case cover is provided on the top/upper surface with a positive electrode terminal and a negative electrode terminal which seals the battery twin cell and an internal cell wall interposed in between the positive electrode plate and the negative electrode plate. The positive electrode plate and the negative electrode plate are coupled internally by crimping and potted to avoid inter cell leakage.