Duracell and Energizer alkaline batteries adhere to the standard AAA through D battery sizes and 1.5 volt voltage. They differ in price and life span.
Canton State University of New York tested the life span of different types of Duracell and Energizer batteries in varying environmental conditions.
At room temperature, Duracell Coppertop batteries lasted for 41.1 minutes of continuous use and Energizer Max batteries lasted 54.4 minutes. Duracell Ultra batteries lasted for 59.5 minutes of continuous use and Energizer E2 batteries lasted for 56.1 minutes.
In cold temperatures, Duracell Coppertop batteries lasted for 32.3 minutes of continuous use and Energizer Max batteries lasted for 38.6 minutes. Duracell Ultra batteries lasted for 54.8 minutes of continuous use and Energizer E2 batteries lasted for 36.7 minutes.
Both Duracell and Energizer have recycling programs for discarded batteries. If the batteries are simply thrown away, Energizer batteries have less of an impact on the environment because the company removes mercury and cadmium from the products. Energizer batteries contain fewer toxic chemicals and dangerous metals than Duracell batteries. Duracell batteries are better in terms of safety, because Energizer batteries tend to leak acid days or weeks after expiring, while Duracell batteries may take months to begin leaking.