I think the propane detectors list a 5 year expectancy. Mine started beeping some special signal when it was about done, if I remember correctly. And the newer monoxide and smoke detectors don't have replaceable batteries either. So instead of putting in a 2 or $3 battery, you go buy the whole thing for $20. MAkes sense - for the manufacturer!!
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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