A storage battery is a cell. or a series of cells capable of storing up electric energy and giving it off at a required time. A storage battery acts upon the same principle as a galvanic cell in giving forth electric current as the equivalent of chemical energy, but it differs from the galvanic cell in that once it is exhausted, it is not worthless but can be.recharged by current from a dynamo. The passing of a current from a dynamo, through the storage cell, has the tendency to produce an oxide of lead on one plate, and spongy or metallic lead on the other. If the plates are properly prepared, and the current passed through the battery repeatedly, first in one direction, then the other, the cell will finally be completed or formed
