PK Plus Zinc Cell AA4 appears to be a package containing four AA-sized zinc-carbon batteries. These batteries belong to a common standard size widely used in a variety of electronic devices, ranging from small household appliances to remote controls, toys, flashlights, and many other everyday gadgets.Zinc-carbon batteries are known for being a cost-effective power source. However, they typically have a lower capacity and may not last as long as alkaline batteries. They are best suited for devices with moderate energy consumption and are often used in devices that don�t demand high power output over extended periods.