This standard-duty, 6V lantern battery is a single-use dry cell designed for use in camping lanterns and certain industrial devices, and is a popular choice for hobbyists. For medium-demand applications that need an easily replaced 6V power supply, this disposable battery is an economical choice. The zinc-carbon composition of this dry cell was the earliest practical composition and is still cheaper to manufacture than alkaline or rechargeable cells. They also contain no mercury or cadmium, which makes them less harmful to the environment. This large, rectangular cell is developed specifically for use in lantern-style torches, and has dual, top-mounted spring contacts to facilitate quick changing. Unlike metal and cardboard versions of this battery, this one is encased in a plastic shell, to help prevent moisture and corrosion problems.