Automobile battery: group of similar elements that generates an electric charge. Negative terminal: place where a current conducting wire, the cathode, is attached. Separator: partition that separates the compartments of a battery. Plates and separator: thin, flat, rigid separator sheet. Battery case: casing that protects the parts of a battery. Positive terminal: place where a current-conducting wire, the anode, is attached. Vent caps: row of screwed-on cylindrical pieces that close the openings of a battery