Which should you buy? Not a truer word can be said for the CR and the CRa. Rather than feeling stupid the next time you are in an electrical shop trying to decide which one is right for you, keep reading and we will clear up the confusion. The CR and CRa are logically named.
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Higher is usually better but the battery life findings were contrary to the listed mAh ratings of the batteries. Duracell was found to outperform Energizer. Anecdotal evidence from the author suggests that Energizer AA batteries lasted longer up to three times than Duracell AA batteries when used in clocks. Consumer Reports testing 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.
Tests with different brands and different ambient conditions In a Canton State University of New York test , Energizer and Duracell batteries of various brands were tested under varying ambient conditions. The results were mixed and are presented below.
Results of a scientific test of battery life Price Given that the differences between most AA batteries are not very significant, it is often easiest to buy whichever batteries are cheaper. In general, Duracell batteries are costlier than Energizer. However, prices may vary depending upon the retailer and any promotional offers.
The environmentally friendly and "green" way of living is to use rechargeable batteries whenever possible. Both companies claim to support programs that promote battery recycling. Duracell funds Call2Recycle , a free battery and cellphone recycling program. Energizer supports the Rechargeable Battery Recycling Corporation. Anecdotal evidence suggests there are some leakage problems and safety issues with both brands.
A YouTube video suggests that Energizer batteries leak acid after they expire - even if they are unopened, whereas Duracell batteries do not. The following comments from Internet discussion boards are not based on any scientific research and are, therefore, questionable. I did however never experience a failure with Energizer  Duracells leak more, even brand new, still in the package. The technical specifications of Procell and CopperTop are identical.
Duracell vs. Energizer
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