As an affordable option with a long 10-year shelf life, 9-volt batteries have been the battery of choice for smoke alarms for a long time. The life span of a 9V battery depends on the quality and ...

Beeping or chirping smoke detectors are beyond annoying. Usually, a chirp every 30 to 60 seconds just indicates a low battery. “If it has a 9-volt battery, it needs to be changed,” says ...