They're coin-cell batteries, nothing too noteworthy. I purchased them for a medical digital thermometer. I've only used one so far and it works (as one would expect). I can't yet speak to the other four batteries, or to their longevity. If anything goes wrong, I'll update my review. I do like that the battery capacity (48 mAh) is given on the packaging.I will note that the packaging, while simple, was nice: a simple padded envelope with more warranty info from Celewell printed on the outside. They seem quite adamant about standing behind their product.
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