Average Reviews:
(More customer reviews)The good news: these are genuine Energizers at a great price (about 59¢ apiece, compared to $4 and up at the Shack, for instance), with free shipping. One can buy "no-names" for even less, but given some of the reviews I read about inconsistent performance and possible leakage, I decided to stick with a brand name. The bad news: the 24 I received have a 2006 production date, so they've been on the shelf for four years. While these batteries have a long shelf life, it isn't indefinite.
This was confirmed by my voltmeter, which read a consistent 2.8v on the several I tested. A new CR2032 will read about 3.1-3.2v, and "dead" ones I took out of an LCD clock/calculator and a car key fob read about 2.2v. So the ones I received had lost about a third of their useful life (your mileage may vary, and perhaps some are newer). Also worth mentioning (as others have): these batteries don't come packed as illustrated; mine arrived in strips of five in plastic/foil blister packs, much like many pills. From my perspective, this is a plus: it makes it easy to compactly pack them as spares without breaking the seal until they're needed. Bottom line, these are still a good deal even if they only yield two-thirds of their full life. My 3-star rating reflects the nearest approximation of that estimated lifespan.
Speaking of maximizing lifespan, the only difference between the CR2032 and the equally common CR2025 is the thickness and capacity (the "20" means 20mm diameter and the "32" means 3.2mm thickness). The CR2032 has a nominal capacity of around 240mAh, whereas the thinner CR2025 puts out about 163mAh. Since I have gadgets that use both, I was planning to buy a supply of each, but I discovered that at least in the clock and fob applications above I was able to replace their CR2025s with CR2032s with a bit of shoehorning. Obviously this won't work in all applications, but where it does, one should be able to improve battery life by almost 50%.
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