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My smoke detector beeps constantly when connected. Looks like I need to change the battery. But I have no clue where to put in the battery or how to change. Your help will be appreciated.

The unit is on the ceiling. I just held the cover next to it for the photo.

my smoke detector

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Doesn't look like it has a battery. How old is it? There should be a manufacture or expiry date written on the cover.

Many older AC powered detectors didn't have backup batteries. That cable you unplugged is the AC power. If it's over 10 years old (or maybe it's 5 years now) it should be replaced anyways.

Replace the smoke detector. They aren't expensive. If it is acting up you don't want to depend on it when there is a fire.

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  • Having just replaced my detectors last year, newer detectors have a 10 year life span. I dated all of mine to ensure I knew when they were due.
    – Pᴀᴜʟsᴛᴇʀ2
    Mar 17, 2016 at 10:16
  • @paulster2 There may be local rules limiting their lifespan to less than that regardless of what the mfg says - my city was talking about doing that but I don't recall if they actually did.
    – Grant
    Mar 17, 2016 at 13:29
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When the radioactive bits decay too much, they don't emit enough radiation for the detector. Because of this, the alarm will sound or chirp (by design) so that you replace the alarm.

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