smoke detector

Faulty Smoke Detectors - How to Get The Smoke Detector to Stop Beeping: Why does it always happen at 1:45 a.m. on a night where you went to bed early and were trying to get a solid night's sleep. Smoke detectors need batteries every year, but they the unit itself goes bad every 3 to 5 years. Ours is 5 years, 10 months old.