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Title: Problem with early model?
Review: I purchased 4 KN-COSM-B alarms in 2005, not realizing they were "old stock" manufactured in 2001-2002. I was not too concerned about the batteries not being fresh, after all you are supposed to change your alarm batteries frequently. However, after 3 years one of the alarms (mfg in 2001) began to chirp without the "low battery" message, indicating a failure. New batteries and a reset did not help. I contacted Kidde and they sent me a new replacement. Now a second of the original alarms (mfg in 2002) has the same chipring problem and Kidde again offers a replacement. No telling yet how long the replacements will last, but at least for the early models, about 7 years from manufacturing date is the useful lifetime.
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