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Optima XM-How to Replace my Optima XM Alarm Battery?

How can I replace the battery in my Optima XM Alarm without setting off the alarm?
I have the User Code & the Engineer code, but do not want to remove the panel screw until I know how to stop tamper alarm(s), if this is likely to sound off.
Thanks for any assistance.
Patf, September 2009
link Click here to see other fixes for Optima XM.