the fire alarm draws milliamps in quiescent state and then maybe into amps if using lots of sounders etc but only for a brief duration during tests etc.
alot of hassle for something that is not a huge power user.
For now 'Yes', but the time is coming in just very few years you may change your mind Grame, the world economic crisis is deeply based on the use of Biofuels which sore up the food prices world wide, the oil prices too, I used to have full tank of diesel for say £50 now I have to pay £100, in additions to none environmental ( 30 years old ) nuclear power stations that need investment of billions to renovate them (it has to be from tax payer’s pocket obviously), also the instability of the middle east conflict which is fairly clear to every one, top it up with the climate change issue... all of these and many others are really pushing the things to be though about before it will be very late...
We may miss to have fresh cold drink from the fridge or not watching TV at night, but not having a special care about power provision for fire alarm systems is a Red line isn't?
This is just my opinion