On Saturday 23 November 2013 14:28 ARW wrote in uk.d-i-y:


The chirping often happens in the middle of the night as that is when the
temperature of the house drops, that temperatrure drop also drops the
voltage on the battery and the alarm starts to chirp (it detects the low
voltage on the battery).

Makes sense and a most useful snippet - ta!

And not hugely obvious - I've seen batteries drop voltage badly outdoors in
winter, but would not have assumped that a cool night indoors could make
enough difference.

--
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