On 1/18/2011 3:20 AM, harry wrote:
On Jan 18, 4:32 am, wrote:
OK, I am in disagreement with a friend and would like your feedback.

At 3:00 this morning, a battery was dying in my smoke alarm and started
chirping. It makes my little dog shake like crazy. So, I had to go to
the garage, get the tall ladder, and remove the battery.

My friend said to just flip the switch at the fuse box and that will
take care of the chirping noise until I get up to put in a new battery.

If the battery is there to backup the smoke alarm during a power outage,
why would shutting off the switch in the fuse box keep the battery from
chirping?

Thanks.

There are two sorts of smoke detector. Some just have batteries. When
the voltage falls they chirp to let your know you need a new battery.
One some the chirp can be temporarily cancelled by pushing the button
on the detector.

Some are mains operated/battery backup in case of mains failure. So
turning the mains off makes no difference, the battery takes over .
They may chirp if the battery is down as well as the mains. But
turning the mains off makes no difference. To stop it you will need
to push the button or remove the battery.
This is exactly what I thought. Many thanks.