SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/dad-smoke-batteries-twice

How often does Ready.gov say to replace smoke alarm batteries?

Twice a year, unless 10-year lithium.

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  1. Once every five years
  2. Twice a year, unless 10-year lithium ✔
  3. Only when they chirp for a week

Why: Ready.gov says to replace batteries twice a year, unless you use 10-year lithium batteries. Many people do it when clocks change.

Huh, didn't know that: Ready.gov says to find two ways out of each room in case the main way is blocked by fire or smoke.

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Slept like a log last night … woke up in the fireplace.
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References

Answer: Twice a year, unless 10-year lithium. Ready.gov says to replace batteries twice a year, unless you use 10-year lithium batteries. Many people do it when clocks change.

  1. Ready.gov: Home Fires www.ready.gov/home-fires
    Replace batteries twice a year, unless you are using 10-year lithium batteries.
    Checked 2026-10-10.

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