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Why did my alarm (SL8 G3) go off during power cut, if not set beforehand?

Why did the external alarm on my SL8 G3 intruder alarm sound during a power cut despite not being set prior to the power cut?
Ian, July 2011
And the battery needs replacing.

Alarm, July 2011
...... because the battery that you have never replaced since the system was installed has died.

It may be a rechargeable battery but they are not designed to last for ever, 5yrs max, before if fails normal testing.

acorn, July 2011
What did it say on the panel?
Do you mean the external bell went off?

Use the search facility here for YOU NEED A NEW FOOKIN BATTERY

Alarm, July 2011
link Click here to see other fixes for G3.