We had this recently. It turned out there were two additional smoke alarms in this flat we'd hitherto not noticed... ONE of the three was out of juice, and vociferous about it. Of course, it was the best hidden, and easiest to reach.
That's the case with the smoke alarms here. It also means that when you burn the toast, *all* the alarms go off. And there's no "It's only the toast!" button on them.
Curiously the smoke alarm (actually a heat alarm) I had down had a sticker stating "This heat alarm will not operate without a working battery".
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Curiously the smoke alarm (actually a heat alarm) I had down had a sticker stating "This heat alarm will not operate without a working battery".