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John G. Tingley
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Energizer Lithium Coin Blister Pack Watch/Electronic Batteries, 2 - Count (Pack of 12) Review
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I checked the manufacturer [...]characteristic sheet. It takes 900 hours under very light load conditions to bring a new battery down to 2.8V. After that, only 25% of the life ("juice", or mAh) is left, or 300 hours more to bring it down to 2.2V at a small load typical of use (15k Ohm). The 2.8V measured of these batteries corresponds on all their tech sheets to only one quarter of their life left. That is not a guess or opinion; it is apparent right off the discharge curve on all the name brand manufacturers' specifications for their respective Lithium CR 2032 coin batteries.
Manufacturers recommend replacement of this battery when it approaches 10% below spec (falls from 3V to 2.7V). Maybe the 10% loss is a little stiff, but there really is only 10% or less of the life left when it reaches that voltage level. These 24 batteries being reviewed are not a good deal even if there are no shipping costs and you don't mind replacing the batteries, but generally, why would someone buy a lot of three-quarters dead batteries unless they had many appliances or just needed to give someone else a device with a battery working for the moment. By the time you use a few of these products being reviewed, the rest will be discharged further. I ended up paying $3.59 (actually $3.06 w/free shipping as I bought them on subscription every 6 months) for an Energizer 2-pack of brand new 2032's with free shipping directly from Amazon ... I'll report on them when received.
Edit: I just went to my local supermarket the day after writing this review. Found brand new two-packs of CR 2032 both of Duracells and Energizers. The Energizer two-packs were new and cost $3.69 and the batteries were marked made in Indonesia, expired in 2018. The Duracells were remarkably only $2.49 for the two-pack and expired Mar 2019, made in Japan, and the copyright on the packaging is (c) 2009. Even though I am waiting for this order, I bought the Duracell two pack. Measured the new voltages on my VOM and they are both nearly 3.4V under no-load. At the 2.8V mentioned by the reviewer here, the out dated batteries being sold at 0.59 each are a a loss of money for the charge you get and you have to buy many of them and store the extras even longer. I strongly recommend against buying these batteries. Go with the new ones. At $1.34 each tax included from my supermarket, if the Energizer technical data sheet is even close to correct and comparable to new Duracells as well (it is, I just checked Duracell's tech sheet off their website, note: according to the Duracell tech sheet vs. Energizer's, when the Duracells go dead it will be even more speedy finish than the Energizers, so the Energizers will actually give you an extra 10% or so as they begin to fail). That is only a minor point, though as the 10% is iffy at the end of the battery's life and may give a feel that the Energizer is slightly better but a quick check of all the major brands including RayoVac, Maxell, Sony and Varta show all these name brands are so close in performance that price and freshness should be the only factor considered.
Interestingly, I also found a generic tech sheet for a cheapo Chinese 2032 which shows they start out with half the capacity (charge) and half the shelf life when fresh (5-year shelf life). So if you stick with any of the main brands mentioned previously, you can shop for the best value. My new Duracells from the supermarket can be expected to last about 4-5 times longer but cost only 2.27 times the price. In summary I will get twice as much juice (about 240 mAh for $1.34 vs. about 50 mAh for $0.59) for the price. Don't know if it was a lucky deal, but they weren't even on sale. For anyone who likes the benefit of ordering on line, I strongly recommend buying new batteries - the ones sold directly by Amazon with no third party involvement. The convenience of front door delivery is offset, in my opinion, since by using these batteries you will have to change them at least four times as often and that can be a pain, especially when you think you still have a bunch but don't when you need it because of the fast rate you run through them. But due to the discharge specs, if you want to fool with somewhat stale batteries and hope for the best, Energizers are the way to go, and not Duracells due to the way Energizers gradually die compared to more sudden finishing of Duracells.
For the technically inclined, I will post what the voltages of the new Amazon sold and fulfilled 2032s are as soon as I receive them. BTW, the cheapo batteries that came with my kitchen food gram scale had lasted about 2 months before the scale started to shut off after giving a low battery indication until it became impossible to weigh anything before it turned off. I just measured their voltages and both are at 2.75V w/o load. Their brand is GLD which is manufactured by Shenzhen Gaonengda Battery Co., Ltd., in China. Given Ken's value of 2.8V for the Energizer batteries being reviewed here, that would be a big mistake to buy them since at 2.75V my appliance no longer will function. Other appliances may be more tolerant but that's just scraping the bottom of the barrel even if the Energizers are more resilient. THE 2.8V ENERGIZERS(C) 2006 ARE A VERY BAD DEAL !
2nd Edit: 2 days later. Data for comparison for 2-pack of Energizer 2032's "sold by" Amazon.com and arrived very fast, made in Indonesia: Expiration date: Mar 2018, copyright Date: (c) 2010, which suggests the bulk purchase of the item being reviewed here: (c)2006 indeed means they are 4 years old. The open voltages on the new Amazon.com pair are the same and right at 3.4V, identical to the new Duracells. The pair will last approximately as long as 9 of the (c) 2006 2.8V dual 12-packs in some of the other reviews for this item.
Final comments after studying this: The frequently quoted shelf lives of 7-10 years means under normal conditions they will still have some charge left, though it will be diminished. The real problem with these batteries after reading all the technical spec sheets is not how old they are, but rather whether they have been exposed to warm temperatures while on the shelf. If they are stored at 140 F degrees (60 C), the battery will be completely dead in 60-100 days while just sitting on the shelf (the equivalent of 10 years of storage at room temperature of 68 F / 20 C). Even at 100 F the batteries will be discharged in a couple of years or so. On the flip side, if properly stored at about 68 F / 20 C they will lose only 1% of their juice per year in the early years, though this degrades as time goes on - and gamble for good quality batteries is the storage conditions. For me, I could never recommend any of these resellers after critically reading the reviews as in almost all cases it seems the amount of juice left (mAh) is simply too little and you will spend more on batteries with them as well as be bothered by having to replace them 4 times more frequently. You are gambling at best and the House is stacking the cards in their favor as you have no idea of the history the older batteries have gone through and there are no guarantees whatsoever. It is possible someone will send you fresh batteries ... in which case you'll get a gift compared to other reviewers' experiences, but that is a gamble and not a purchase based on value.
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