The Nest has a battery that renders the unit useless after 6-7 years. The $45 simpler ones last for decades.
CO detectors tend to have a lifespan of 2-7 years. Smoke detectors about 10. Replacement is advised after those times due to needing a newer sensor. Same applies for the Nest detector. It's not tied to battery life.
CO detector lifespan from two manufacturers:
http://www.kidde.com/customerservice/pages/replacecoalarmsevery7years.aspxhttp://www.firstalert.com/faqs/co-alarm/...a-co-alarm-lastSmoke detector recommendation from fire marshals citing the 10 year recommendation:
https://www.firemarshals.org/rfsi/smokealarmfacts.html10 years seems to have been picked based on historical failure rates. 3% fail in 10 years to detect properly. Out to 20 years and it jumps to 46% (Based on a Minnesota study, also referencing a study by the Ontario Canada Housing Corporation.
https://dps.mn.gov/divisions/sfm/public-...replacement.pdf )
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