When should I change my Smoke Alarm batteries?
Smoke Alarm & Carbon Monoxide Alarm batteries should be changed every six months. A good way to remember to change your Smoke Alarm & CO Alarm batteries is to change them when you change the clocks.
You should also test your alarms once a month by hitting the test button or following the dirrections printed on the back of your alarm.
Smoke alarms also only have a lifespan of ten years. After ten years from the manufactured date, printed on the back of the alarm, they must be replaced.