Batteries last for ages unless you have it mounted over the toaster of
Additionally you then need power, I'd expect any old 9v supply could be used
with a cheap battery operated one but I believe that most of the mains ones
also have a rechargeable battery inside in case of a power outage caused by
the fault which caused the fire in the first place!
I never did understand why the Fire service who fit these battery ones for
free, simply put them up with sticky plastic pads. I did the same myself as
they told me that by the time the thing was hot enough for the glue to melt
you would be dead if it had not gone off from the smoke! Not sure I buy
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I've got 3 Fireangel ones, supplied free by our local Fire Service
(they would have come out and fitted them for free as well, but I
diy'd it). Battery operated, 10 year life, battery not replaceable.
One failed after 8 months, another after 16 months. Called by the fire
station this morning and they have a great big box of failed ones
waiting to go back. Googling finds lots of reports of early failures,
and mixed response from original suppliers about replacing them
Fire station has no replacements in stock, awaiting a delivery of a
newer model (still Fireangel).
Is this the failure of the battery or some other failure mechanism?
I've had so called long life smoke detectors where the 10 year battery
has gone flat enough for the detector to chirp after around a year. The
batteries are non-replaceable only because of a melted plastic rivet
holding on a battery cover. 10 seconds with a drill and probably you
will find you will have a removable PP3 type lithium battery which can
be replaced with an 'ordinary' PP3 battery.
I fitted some of the 10 year lithium batteries in smoke detectors in
my parents' house. They started chirping after a year. The problem
was not a flat battery, but that the battery voltages are 11V.
Don't know why they waited a year before starting to chirp. Put
ordinary alkaline PP3's back in them, and they've been fine ever
[email address is not usable -- followup in the newsgroup]
Mains interlinked, with backup batteries, and a remote test / hush
switch is my preference (especially if you have high ceilings and can't
easily reach an alarm to silence it). If they mount on a standard base,
then even better.
I used aico / Ei ones, but the other well known brands should be ok.
I have had them in 8 years so far, and I don't think we have had a false
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