Method of making a miniature concentric battery

A method of making a miniature electric cell comprising the steps of inserting a cathode, an anode and a separator into a cylindrical metal container;

• inserting a sealing element into the open end of said container with said sealing element having an unobstructed, hollow, tubular element extending therethrough;
• permanently sealing said container to said sealing element;
• introducing a fluid electrolyte from an electrolyte reservoir into said sealed container through said sealing element via said unobstructed, hollow, tubular element;
• separating said hollow tubular element from said reservoir and permanently preventing said electrolyte from escaping from said container via said tubular element.