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. Major advantages are: . Dependable, long lasting power with up to a 7-year freshness guaranted . Operates reliably in temperature extremes of -20° C to 54° C . Date coded to guarantee freshness . Contains no added mercury