Publisher Summary Types of metal-air batteries discussed in this chapter are zinc-air primary batteries, zinc-air secondary batteries, and aluminum-air secondary batteries. Zinc-air cells also have applications in navigation aids. McGraw Edison, for example, supply the Carbonaire range of batteries covering the following applications: short lights of all types, such as reef lights and lights on fixed structures Further, aluminium-air batteries have a high power density. This has led to proposals for their use in the following applications: marine lights, toys, reserve lights, and range extenders for lead-acid vehicle batteries.