The Eveready Super Heavy Duty Advantage Trusted quality an affordable price for families all over the world and budget-minded consumers. Life Runs on EVEREADY! Powerful Perfomance, Value Priced. Smart, trusted choice for families. Holds power up to 3 years in storage. General Features Chemistry: Zinc-Manganese Dioxide (Zn/MnO₂), also known as Carbon Zinc No added mercury or cadmium Best for: Low-drain devices (e.g., lanterns, smoke alarms, radios)