The Energizer Special A27 battery is ideal for special devices such as heart monitors, remote controls, keyless access systems, glucose monitors, toys, and games. With reliable and long-lasting performance, these batteries retain energy for up to 3 years when stored, without leaks or sulfation. Energizer, a leader in the battery industry since 1896, has eliminated mercury and cadmium from its batteries and cares about the environment. Remember to recycle used batteries at the clean point in your locality. Discover our complete range of products to meet all your needs.