Man the reason I've been ranting on the forum is I've been hearing a fire alarm do it low battery beep every 45 seconds for the last 4 hours.

I had to put up acousic blocks to find the little sucker, I disconnected all of my hard wire units through out the house and when i finally thought I found it ....beep, I put all the detectors in the garage........beep. I singled finally narrowed it to inbetween my basement ceiling and upstairs floor I took out about 20 ceiling tiles until I found a lone smoke detector laying in there.....on top of the very first tile I slid aside to look up there.