Make sure you use a high quality battery. I think they recommend certain brands/models. I know my mom replaced her batteries with some ones she bought at a dollar store. The alarms kept chirping. When I replaced those with Duracells, the chirping stopped. If you're using proper batteries and they are still chirping, it may mean the units are dead/defective. While the CO alarms are supposed to last about 10 years, most of ours have had to be replaced after about 5 years.
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