Just remember that carbon monoxide detectors have a fixed life that varies with the manufacturer. Once that time limit is up you need to replace the detector. The lease expensive method is to just get the same or similar replacement from Amazon or one of the big box stores. The most expensive but the least maintenance in the long run is to replace your detectors with Nest smoke/carbon monoxide detectors. I replaced my wired detectors with the Nest wired detectors and the batteries last 10 years and they check themselves automatically once a month and report the status to your cell phone. If any of the detectors trigger for any reason you get an alert on your cell phone as well.
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