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How can I replace battery on the control panel?

I wonder if any one can help I want to replace the back up battery on my intruder alarm scantronic 7800.
Can someone help? what cade I will need to open the control panel without setting the alarm.
Thanks

Jav
February 2009
Hi John
Thanks do I need eng code to open control panel?

Jav
February 2009
it will take 12volt 2.8 amp or 7 amp, 2.8amp is plenty
maplins sell them .

john martin
February 2009
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Free repair help for Scantronic home alarm systems

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Mend Security Systems, Home Alarm Systems
Free repair help for Scantronic home alarm systems