Ours are the same way, just put brand new Batts in 2 months ago, and already starting to chirp. I was told to look at date on back of them,,, most likely they need replacing. These units are bought in mass quantities. For the most part are close to shelf life when installed in the homes. That is from a Fireman in TV. SO now we need to start replacing them. We moved in in 2008, and have had problems with them since 2010. Do not put cheap 9v batts in them. Was told to use the energizer 9 volt batts.
Go FIgure..
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