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Osem · 18-11-2013, 12:05

I've just discovered that our alarm system (Sterling 10 installed 5-6 years ago) has a problem. When the mains is turned off, the main alarm sounds even though the alarm system is 'unset'. What's more, the remote illuminated keypad goes dark/blank and no longer operates so I can't reset the system or stop the alarm until the power is back on when the unit operates normally again. In the past, during a power outage in its unset state, it would remain illuminated but sound a periodic beep every 10 seconds to alert us to a power supply fault. Since this no longer happens I'm assuming the internal 12v backup battery has failed. Presumably the external sounder is going off because has its own battery and is falsely detecting a tamper condition due to the lack of backup power from the main unit.

Anyway, I've had a look on the net and found a couple of posts on this subject which I'm not sure about so would like a bit of feedback from people I trust i.e. you lot!

I'm hoping it'll be a straightforward job to replace the internal lead acid battery but am a little worried that if I go about this the wrong way I might wind up causing spurious set up/code problems which I can't sort out. Since I have to turn off the mains supply before I open up the control box the alarm is going to sound until I can get the power back on again so I'm wondering if there's a certain procedure I should follow (e.g. I know there's an engineering mode but I don't have the code for it) and if I remove and replace the battery with a new one am I likely to have any issues when powering the system back up? I guess I'm wondering if the unit might become 'confused' in some way because it's been subject to power interruption and tamper conditions at the same time. The last thing I want is to turn it all back on only to find can't stop the alarm going off...

One forum mentioned that the internal battery is this MM26D available from Maplin for £38:

http://www.maplin.co.uk/sealed-lead-...atteries-19363

But I've found what seems like a very similar battery for half that price from Screwfix here:

http://www.screwfix.com/p/sealed-lea...ails_container

Would this work? (obviously I'd check what the existing battery is before buying a replacement).

http://www.screwfix.com/p/sealed-lea...ails_container

Any help much appreciated as always.

18-11-2013, 12:05	#1
Osem Inactive Join Date: Oct 2006 Location: Right here! Posts: 22,315	Alarm system backup battery problem I've just discovered that our alarm system (Sterling 10 installed 5-6 years ago) has a problem. When the mains is turned off, the main alarm sounds even though the alarm system is 'unset'. What's more, the remote illuminated keypad goes dark/blank and no longer operates so I can't reset the system or stop the alarm until the power is back on when the unit operates normally again. In the past, during a power outage in its unset state, it would remain illuminated but sound a periodic beep every 10 seconds to alert us to a power supply fault. Since this no longer happens I'm assuming the internal 12v backup battery has failed. Presumably the external sounder is going off because has its own battery and is falsely detecting a tamper condition due to the lack of backup power from the main unit. Anyway, I've had a look on the net and found a couple of posts on this subject which I'm not sure about so would like a bit of feedback from people I trust i.e. you lot! I'm hoping it'll be a straightforward job to replace the internal lead acid battery but am a little worried that if I go about this the wrong way I might wind up causing spurious set up/code problems which I can't sort out. Since I have to turn off the mains supply before I open up the control box the alarm is going to sound until I can get the power back on again so I'm wondering if there's a certain procedure I should follow (e.g. I know there's an engineering mode but I don't have the code for it) and if I remove and replace the battery with a new one am I likely to have any issues when powering the system back up? I guess I'm wondering if the unit might become 'confused' in some way because it's been subject to power interruption and tamper conditions at the same time. The last thing I want is to turn it all back on only to find can't stop the alarm going off... One forum mentioned that the internal battery is this MM26D available from Maplin for £38: http://www.maplin.co.uk/sealed-lead-...atteries-19363 But I've found what seems like a very similar battery for half that price from Screwfix here: http://www.screwfix.com/p/sealed-lea...ails_container Would this work? (obviously I'd check what the existing battery is before buying a replacement). http://www.screwfix.com/p/sealed-lea...ails_container Any help much appreciated as always.