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Batteries, if replaceable, should be changed at least once a year, if not twice. Your personal safety is worth a lot more than a few dollars in batteries. Also, consider changing them if you have been away for a few weeks, in case you happen to have "missed" the periodic "low battery" beeping while you were gone.

Every Friday you should press the button and check if your smoke alarm battery works, if it doesn't, you may need new batteries or a new smoke alarm.

Smoke alarms (and smoke detectors as part of other alarms) should be replaced every ten years, whether you think they need it or not.
Check your instructions. Some (mains-powered) use a backup battery that may need to be recharged/replaced at specific intervals.

Ours are all powered by 9-volt transistor radio batteries. I get the long-life Alkaline variety.

Be aware that *no* rechargeable battery is considered reliable for this application (relying *only* on its battery for operation with no mains connection).

We change ours every time we go into daylight saving (i.e. once a year).

The reality is that the battery will probably last longer, but for something that's going to save my life and the life of my wife and kids, a few bucks per year for a battery I can reuse in a radio is pretty cheap.

Yearly, date of own choice.
It depends on how your alarm really.

It strongly suggest that you check it reguly once-twice a week.

Then you know you are safe.
every year
The National Fire Protection Association (NFPA) suggests replacing a 9 V alkaline battery in a smoke detector once a year, and to test it once a month. See the related link below for more information.
Every 12 months

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13y ago

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