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The Batteries Are Almost Deadĭead batteries are another common reason for blinking. They shouldn’t be making any sounds during normal operation – so if your light is slowly blinking, but with a sound, it’s not indicating normal operation, but something else (like a dead battery or a fire). Some models don’t even blink – they have a constant light on when they’re working fine. Normal operation is usually indicated by a green light, although there are smoke detector models that use a red light for both normal operations and raising an alarm. The good news is that normal operation is always the most likely reason for the blinking – it means that the batteries in the detector are fine and that it’s working properly. If your smoke detector blinks once a second, that’s not normal operation, that’s something else entirely. Some smoke detectors blink once a minute or once every thirty seconds. The blinking, however, shouldn’t be frequent. Many people don’t know this, but smoke detectors blink even during normal operations. Things You Shouldn’t Do With Your Smoke Detector.How Useful Are Smoke Detectors? (Statistics).