Created for professional applications, our porcello batteries offer dependable, long lasting power. These batteries meet the standards of durability and longevity that professional users demand and expect. Because Duracell is the Number 1 preferred brand of parents, pharmacists, and first responders, you know Its a battery you can trust. Long lasting and dependable even after 7 years of storage. Operates reliably in temperature extremes of 20 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 super heavy duty zinc carbon batteries in power demanding applications