Fire Alarms

[joe.s-b]

Why does my fire alarm indicate a failing battery only in the middle of the night?

[ummmm]

*** law.

[ummmm]

***...

[wolf63]

S0d5 law

[ummmm]

Blimey...it's not even a swear word!!

[wolf63]

***
Bitches

Checking lady dogs

[joe.s-b]

Thanks all. No further advice required.

[factor-fiction]

Sod's law should be okay

[Baldric]

http://www.theanswerbank.co.uk/Technology/Electronics/Question1380020.html

[factor-fiction]

Maybe you are out a lot during the day or other noises drown out the sound

[paddywak]

Actually you are all wrong the gremlin that works the battery failing alarm is nocturnal and only works on the night shift.

[beso]

Batteries perform worse at low temperatures. The coolest time of the day is usually early in the morning.

[DMG1]

Fire alarms can now be installed with a power supply to them ,usually from a local light circuit, they then have battery back up by rechargable batteries.

[joe.s-b]

Thank you all. I meant smoke alarms of course but your answers al suited. I have gone lithium.