Panasonic Special Zinc Batteries AAA Card of 4 Leading battery manufacturer Panasonic utilises zinc carbon technology to bring you a reliable battery at an excellent price. They are also free from mercury, lead and cadmium, making them a more environmentally-friendly choice. Zinc carbon batteries have a low capacity, making them particularly suitable for for low to medium energy drain devices such as clocks and remote controls. These Panasonic batteries are extremely economical, offering a great cost per hour and ensuring that they won't need to be replaced frequently. Each battery has a shelf life of 3 years, so you can keep a pack in the drawer, confident that you'll always get a great result, whenever you need to use one.