You should get one that's wired to the mains
Then the batteries can't run out and you won't die.
(Bazongaloid, Mon 28 Feb 2011, 13:10, 1 reply, 15 years ago)

Mine have both
I can only assume this is to allow for power cut timed firey death avoidance
( sporters I’m sincerely gratitude to you, Mon 28 Feb 2011, 13:14, Reply)

I often think that I should put batteries back in mine and put them back on the ceiling....

( Vipros. clever got me this far, then tricky got me in, Mon 28 Feb 2011, 13:17, Reply)

Please don't.

( Monty Boyce, My cheese game is strong, Mon 28 Feb 2011, 13:19, Reply)

haha!

( sporters I’m sincerely gratitude to you, Mon 28 Feb 2011, 13:23, Reply)

The one is the hall is too bloody keen to go off
to the point that when you cook (i.e. not burn) anything it goes off. My daughter now knows to stand underneath it and wave frantically as I wave a tea towel at it until it stops
( sporters I’m sincerely gratitude to you, Mon 28 Feb 2011, 13:20, Reply)