• Fredy1422@lemmy.mlEnglish
      8·
      2 年前

      they have, although some do take AA or AAA batteries but its very uncommon. some especially carbon monixide dectectors have internal batteries that require replacement.

      • variants@possumpat.ioEnglish
        81·
        2 年前

        We just bought new smoke detectors and they take AA, I bought a 9v just out of assumption and got home and was blown away

          • randombulletEnglish
            3·
            2 年前

            Eh not quite. AA are 1.5v so two would only be 3v.

            You might be thinking of the big 6v lantern batteries. They’re usually 4 x 1.5v cells together.

            • GladiusB@lemmy.worldEnglish
              1·
              2 年前

              I thought I watched some YouTube video where they linked them and it worked. But who knows how accurate the numbers were. I guess not since you know.