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Change your smoke detector battery. You're keeping the whole neighborhood up.
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It's important to replace smoke detector batteries on a regular basis, about once every year. They are designed to last for up to 10 years, but you should replace them sooner if you notice any irregular chirps indicating a weak battery. You can usually buy replacement batteries at local hardware stores, or by ordering online. The smoke detector should be located near a ceiling light fixture or easily accessible electrical outlet, and has instructions to replace the battery on the underside or back side of the detector. Make sure to test the system following battery replacement to make sure it's working correctly, and replace the battery again if the test chirp doesn't sound.