Abstract: A mechanically rechargeable electric battery includes at least one electrical cell which has a pair of generally planar outer electrodes configured to define therebetween an interior space for an electrical power storage medium, and inner electrodes removably-mounted between the pair of outer electrodes so as to be in electrically conductive contact with the electrical power storage medium and configured to provide mechanical support for the electrical power storage medium and to be removable as a unit therewith from the cell. The cell is a metal-gas battery cell and the electrical power storage medium contained in the interior space contains a slurry containing active porous zinc particles saturated with an electrolyte solution. The outer electrodes define an opening communicating with the interior space, and the inner electrodes are configured for their removal from the interior space, via the opening, thereby enabling the simultaneous removal of the inner electrodes and the slurry from the interior space.