Bests & Worsts Reviews from Amazon

For the record, the ONLY difference between Procell and Coppertops is packaging and marketing. They are the same battery otherwise, spec for spec, graph per graph... look them up. Procell batteries are aimed at "professionals" who don't need retail packaging. Only Coppertops come in blister packs that can be hung on store shelves. Procell batteries come in bulk packaging for easy use, distribution and access. All this aside, they are great batteries. My warning to online buyers is that you don't know how old your batteries are. These batteries have a 7 year shelf life, quoted from the Duracell website: "Procell batteries deliver outstanding performance with a 7-year freshness guarantee backed up with date coding." Knowning that, I would really like most of that life to be on my shelf, not the store/warehouse. I received batteries on 5-1-2012, they are date marked to be good til 2015. That means my batteries have been sitting around for 4 years. Knowing I'd like to get at least 1 year life out of the batteries I should really use them by 2014. That shouldn't be hard since this house has at least 10 smoke detectors. But just be warned if you are buying in bulk and check the date upon arrival. I appreciate sellers that list the expiration date. Beware of really low prices, as they may have batteries with only a year or so left. Hope some of this clears up the misinformation out there. Before you buy, check out this product and see if its a better price... it is the same thing: DURACELL 9 Volt PROCELL Professional Alkaline Battery, Pack of 12