Chemical Manganese Dioxide, Zinc, Potassium Hydroxide, Graphite, Natural or Synthetic, Battery. Duracell Procell® Alkaline batteries deliver outstanding performance and reliability. Long Lasting and Dependable — Even After 7 Years of Storage. Operates Reliably in Temperature Extremes of –20°C to 54°C. Date Coded to Guarantee Freshness. Economical Bulk Packaging for Professional Applications. Contains No Added Mercury. Long Service Life at High Drain Discharge. Lasts Up to 10 Times Longer than SuperHeavy-Duty Zinc Carbon Batteries in Power Demanding Applications.