Results of a scientific test of battery life Price The results were mixed and are presented below. In a Canton State University of New York test, Energizer and Duracell batteries of various brands were tested under varying ambient conditions. Tests with different brands and different ambient conditions
This video from Consumer Reports reveals some interesting findings not just about Duracell and Energizer but their specific variants, as well as their comparison with Walgreens-branded batteries. Anecdotal evidence from the author suggests that Energizer AA batteries lasted longer (up to three times) than Duracell AA batteries when used in clocks. Duracell was found to outperform Energizer. In another experiment, C batteries from Duracell and Energizer were compared for continuous use with a Flashlight. Higher is usually better but the battery life findings were contrary to the listed mAh ratings of the batteries. mAh stands for milliampere-hours, which is a unit of electric charge. Both companies batteries are NiMH (nickel metal hydride) the Duracells are 2000 mAh and the Energizer batteries are 2200 mAh. When comparing rechargeable AA batteries, Gizmodo found that Duracell lasted longer (5 to 6.5 hours) than Energizer batteries (2 to 3.5 hours).