The battery is usually removed to stop a nuisance alarm or to stop the low battery alarm. When the battery in a smoke alarm is low the unit will chirp about once a minute. When this occurs the battery needs to be replaced as soon as possible. It is a good idea to clean smoke alarms once a year. This can be done at the same time as the battery is replace.
Dust can accumulate inside the unit.
Cleaning can be accomplished by vacuuming around the outside of the alarm. Replacement Some alarms work continuously 24 hours a day even if smoke is not present. The electronic sensors inside or constantly monitoring the air for sign of danger. Just like any electrical appliance, the components of a smoke alarm wear out over time. The average life of a smoke alarm is 10 years.