PRODUCTION OF INORGANIC POROUS SINTERED BATTERY SEPARATOR ESSENTIALLY ELIMINATING FORMATION OF GAS WHEN IN CONTACT WITH A ZINC ELECTRODE, AND PERMITTING LONG CYCLE LIFE OF A HIGH ENERGY DENSITY BATTERY SUCH AS A SILVER-ZINC BATTERY, PRODUCED ACCORDING TO ONE EMBODIMENT BYY INITIALLY FIRING A MIXTURE OF MAGNESIUM-BEARING MATERIAL, E.G., MGO, LEAD-BEARING MATERIAL, E.G., PBO, AND SILICA (SIO2), AT TEMPERATURE IN THE RANGE OF ABOUT 1,100 TO ABOUTT 1,550*C., TO PRODUCE A MAGNESIUM SILICATE-LEAD SILICATE COMPOSITION, GRANULATING AND COMPACTING SAID COMPOSITION INTO PLAQUES, AND SINTERING SAID COMPACTED PLAQUES AT TEMPERATURE RANGING FROM ABOUT 800 TO ABOUT 1,250*C., TO PRODUCE POROUS SINTERED SEPPARATOR MEMBERS, IN THE FORM OF A SINTERED COMPOSITION OR COMPOSITE OF MAGNESIUM SILICATE AND LEAD SILICATE, HAVING GOOD TRANSVERSE STRENGTH AND LOW RESISTIVITY.