On 18/11/2017 11:34, Davidm wrote:
On Fri, 17 Nov 2017 19:52:14 +0000, Michael Chare
wrote:

My battery operated smoke alarm is quite old. Replacing it with a mains
powered device would not be very difficult. Any suggestions as to what
to buy. No gas supply to house.
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).

I've had a couple of early failures on Fireangels, but still have a
couple going strong.