Duracell Procell Alkaline Batteries, 9V, 12/Box
- Lamps & Fixture Accessories
- Country of manufacture: United States
- Manufacturer: Duracell
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Standard Battery Type Standard Battery, Standard Battery Size 9V, Battery Chemistry Alkaline, Voltage 9, Standards Mercury Free, Standard Battery Series Procell, Package Quantity 12
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A lot of the batteries I have ordered have a shelf life of 2028+
So it seems like it may be old stock ?
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Also the Amazon basic batteries are not exactly the same size. This is a problem if you have battery connection that depend on a squeeze fit on the battery rather than the more traditional wired pop-top with the slightly oversized battery compartment, which I have in my smoke detectors.
The main difference I can find between Procell and retail batteries is that these come in a box with plastic caps on the contacts rather than in retail packaging and of course they are labeled differently. The voltage readings, which factor in the resistance, appear exactly the same, and numerous online sites also argue that they are identical. Duracell is apparently "not saying." Please comment if you find otherwise.
I bought this item back in 2012, but over the years we bought a couple of these 12 packs of various name brands, and they have all performed well for us.
So, what I have been doing is to wait for "one" of the detectors to start squealing the "low battery" tone. Then, I replace all 9 at the same time. I do use a marker to record the replacement date on each battery for whatever later reference. The last time I replaced these was about January 2017. They then have lasted about 3 1/2 years before the first one started "squealing". The "use before date" on the pullouts was "March 2019", about a year before this recent replacement. Therefore, I have been quite satisfied with the longevity of these batteries.
Longevity is one thing but "leaking" is more important as it can damage, sometimes permanently, expensive devices. I have never had a Duracell Procell leak. I do use "cheaper" batteries, including Amazon Basic cells, in some things without trouble. I don't really have any quantitative data, but, over the years I would say that Duracells leaked less and "Bunny" batteries more. I'm sure manufactures are continually trying to improve battery performance, but, there's always cost-reduction efforts and "outsourcing" which can affect performance.
When possible, I remove batteries from devices not in frequent use. Then, I tend to only use cheaper batteries in devices I really don't care too much about, like home Christmas displays.
I took one star off from the rating score because of shipping laziness. (See photo)
The last time I saw anything like this was when, as a kid, I put a big dragonfly in a big glass jar with a big garden spider. When the dragonfly got done flapping its wings, the spider looked like all those 9 volt batteries strewn around the bottom of this Amazon carton. (PETA, don't get any ideas. The statute of limitations has expired.) Even crazier, I mended the box, put the batteries back in it and put them on the shelf. Too much time on my hands.
Again - if you use these heavily and plan on switching out for new batteries every few daysweeks/months - then you will have a fast turnover and the shelf-life won't matter so much; but for us home-users, please note that the date on the pack of batteries I received said 2016. That feels a little short to me (I believe another review mentions this too) as far as the 'good by' date. Compare that with packs of Duracell AAAs and AAs that I just bought from a big box store - the dates on those packs were 2022 and 2023, so I'm not sure if these Procells just have a shorter life in general or if the ones I received have been sitting in a warehouse for several years. I'm not saying this 2016 dates hurts their effectiveness (I've had no devices fail on me since these batteries were put in a few weeks ago), but just mentioning in case another homeowner sees these and thinks he/she can just save them on a shelf to use over the next 3-4 years.