Why Smoke Alarms Chirp at 3 A.M.

That 3 a.m. chirp has a reason, and it’s the same reason your phone dies early on a freezing day. A smoke alarm tests its own battery about once a minute: that little blink is the test. Cold slows the chemistry inside a battery, and most homes are coldest between 2 and 6 a.m., so a tired battery passes all afternoon and fails in the small hours. Those are also the hours when house fires kill the most people. If yours chirps at night and stops by morning, change the battery, and replace any alarm older than ten years. Sources: Kidde, “Why Do Smoke Alarms Always Chirp in the Middle of the Night?” · U.S. Consumer Product Safety Commission, “Final Report on Lithium Batteries Used in Residential Smoke Alarms” (2002) · U.S. Fire Administration, “Civilian Fire Fatalities in Residential Buildings (2017–2019)” #shorts #smokealarm #homesafety #battery #science