Super heavy-duty AA carbon zinc batteries are useful for keeping your devices powered. You can use them in all sorts of household gadgets, from clocks to toys and more. Also ideal for your emergency kit for such items as portable radios, walkie talkies, and flashlights. The carbon zinc formula provides lots of power that remains at a consistent level throughout the life of the battery. Every package has four batteries in it. Very reliable, so you can go longer without having to change out the power cells.