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Ok guys.. Putting a volt meter on a battery proves nothing, as you all rightly poited out. A load test proved the battery shot. New one now installed. Thanks for the advice/replies.

I will take the battery to a local battery centre for proper load testing before I go any further. Thanks.

BTW. I appreciate this advice so please dont think me rude if I dont reply again this evening as I am going out!

OK. Over my head now. What do yo mean by battery leads? Is this just the wires coming off the terminals? Whats the other thing?

Thanks for replying handymanjo. I have removed and metered the battery at 13.7 volts. I did not see any mains failure message, in fact the screen went blank and unlit. When the mains was restored the alarm silenced, the keypad awoke and I could reset it. Then I removed the panel cover and the...

I have just bought a house with a Pyronix Sterling 10 alarm. It has a dedicated mains supply and in internal battery that is in good order. When the power is cut the alarm sounds. Shouldn't the battery maintain the system until power is restored? or is this a feature because the mains...