Water-containing and anhydrous alkaline PEG-based solid polymer electrolytes have been prepared, involving two different technologies. They exhibit a high ionic conductivity, and values up to 10(-3) S cm(-1) are obtained for some compositions at room temperature. Conductivity studies and thermal analysis are presented, and the conductivity vs. temperature behaviour of each type of solid polymer electrolyte studied is discussed. Preliminary results are reported concerning the cyclability of cells involving a nickel positive electrode, and a cadmium or a zinc negative electrode.