How often should I replace my smoke or carbon monoxide alarm batteries?

Wednesday, September 27th, 2017

Unless your alarm came with 10-year lithium ion batteries sealed inside, you will need to replace standard (alkaline) batteries at least once a year. We recommend changing the batteries in all your alarms at the same time. (If your alarm starts chirping, immediately change the batteries! Then hold down the test button for a few seconds to see if you hear a long beep as you should.) One way to remember to do this is to time the battery change around your birthday.  You may choose to go a step further by changing them every six months; you can remember this around Daylight Savings Time: “CHANGE YOUR CLOCKS, CHANGE YOUR BATTERIES!”