Did you assume that it is suggested to change the batteries in the smoke alarm every year? I must admit that I don’t change those batteries frequently, instead I change them when the alarms start to chirp indicating that the batteries are low. That is with any device or even my car, I change the batteries when I assume they are low or after they have died. There was 1 incident where the batteries on my control unit died plus at first, I thought I was having a drastic issue with my central air unit. I was renting a modern home plus didn’t assume that the control unit used batteries. It was an older Heating plus Air Conditioning unit, plus the control unit was digital, although I could tell it was dated as well. At first, I observed that the air had become irregular, however when I turned off the control unit plus turned it back on, the air conditioner returned to normal. This happened for a couple of mornings, plus that is when I thought there was a major issue with the Heating plus Air Conditioning unit. I almost called my landlord to let him assume that I needed an Heating plus Air Conditioning supplier, however after some investigation, I observed that the numbers on the digital screen of the control unit were fading. It was at that moment that I realized that my control unit used batteries. I figured out how to dislink the control unit from the wall, plus I opened the back panel plus updated the batteries. After that incident, I changed the batteries in the control unit once per year to guarantee that my Heating plus Air Conditioning unit functioned respectfully plus to also avoid spending money on unnecessary repair callsâ€¦ Perhaps I should do the same plus change the batteries on my smoke detector yearly as they suggested us to do.