Buy these for your smoke detectors and keep them around and whenever your alarm goes off in the middle of the night when its battery runs out, guaranteed most of these won't work.
^ Most of these 9Vs? I got a pack a little over 3 years ago and all work fine so far. shows this is what I bought but they were in the beige wrappers, and are slightly larger than other brands but still fit in anything I tried to put them in.
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Thank you!