Abstract: A sintered bipolar battery plate (10) is made containing two porous electrodes and a central, non-porous, metallic cell separator-current collector sheet (12) where the positive electrode contains sintered particles (14) of elemental silver sintered into an expanded metal sheet (18) and the negative electrode contains sintered particles (16) of elemental iron sintered into an expanded metal sheet (18), where the positive and negative electrodes are sintered to a thin, porous, metallic connection layer (20) selected from at least one of nickel fiber or nickel powder, which is sintered to the current collector (12). This plate (10) can be placed in a case (22) containing alkali hydroxide electrolyte and having metal end plates (29) for electrical connections.

Abstract: A silver-iron battery is made comprising a case 14 and a cover 15 within which are disposed at least one silver electrode 11, at least one iron electrode 12, a separator system 13 between the electrodes and an alkaline electrolyte, where the separator system contains at least a layer of low density polyethylene, having a density of from about 0.91 g./cm.sup.3 to about 0.92 g./cm.sup.3, graft co-polymerized with an acrylic material, disposed next to the silver electrodes, and at least a layer of high density polyethylene, having a density of from about 0.95 g./cm.sup.3 to about 0.96 g./cm.sup.3, graft co-polymerized with an acrylic material, disposed next to the iron electrodes, and where a layer of cellophane can also be included next to the low density polyethylene and a middle layer of low density polyethylene and be included between the cellophane and the high density polyethylene.

Abstract: An iron-silver battery is made, comprising a case 14 and a cover 15 conaining silver electrodes 10, iron electrodes 11, separators 13 between the electrodes, and electrolyte; where the siliver electrodes 10 are made by mixing a major amount by weight of large Ag particles and a minor amount by weight of small Ag.sub.2 O particles, pressing the mixture to a current collector having at least a nickel surface, to provide an electrode, and sintering the electrode in a reducing gas to provide a body of sintered, all silver particles containing large particles and small sintered-pore particles, having a 50% to 70% porosity and a large surface area, and capable of discharging at from a C/8 rate up to a C/2 rate.