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Remove back up battery Optima xm?

Just moved to this house and need to work on house power circuit. How do I dissconnect the back up battery to stop the alarm when the main supply is off.. PLEASE.
MJHorsford, December 2009
Remove the two wires from the battery termanals Red + and black -.

Wally Gargett, January 2010
It does not need removing, it needs replacing. (It's faulty/dead)

The alarm is only doing what it is designed for when the mains is turned off

acorn, December 2009
link Click here to see other fixes for Optima XM.