Duracell has enhanced its line of alkaline batteries with new Duracell CopperTop. The new improved technology delivers excellent value and provides end users and distributors with a premium-quality, long-lasting, and dependable power source they can trust to perform in a wide range of important professional devices. Dependable, long lasting power providing up to a 7-year freshness guarantee. 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.