Abstract: A method and apparatus is described for filling an electric cell which coises a compartment for receiving a liquid electrode, an electrolyte, and a constraining means in the compartment for constraining the liquid electrode to wet a surface of the electrolyte. The method comprises the steps of introducing liquid electrode material into the compartment, thereby to contact the constraining means with the liquid electrode material. The liquid electrode material is then subjected to a pressure sufficient to force the liquid electrode material to penetrate the constraining means and thereby wet the electrolyte. The gas is maintained in the cell to ensure that the liquid electrode material remains in the constraining means.