Today my blood glucose meter gave a low battery warning. This is the first time that has happened since I got it in October of 2006. I R efficient. (Also, already had new batteries on hand, so swapped 'em out.)
Last year I was getting wonky results and wondered if the batteries were getting low, so I got new ones. Then I read the manual (last resort, heh) and found that it'd give a warning when about 100 uses were left. So the batteries went in the cabinet until yesterday, when the icon popped up. They're the nickel-sized button batteries.
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