chirping noise

I am getting a chirping sound in my T@B CS max.  It started after winterizing.  I put a charged battery in and after a few days the display on the Jensen radio went dark.  When connected to towing vehicle showed 13.4v charging.  Battery read 12.8 v.

i have taken the battery out for the winter and chirping is still happening.   Is there a battery in the co/ smoke detector?  How would I change it.


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