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how to change battery?

I have an optima compact alarm the battery is flat as when power goes off the alarm activates do I need to turn the power off to replace the battery ? because if I do how can I stop the alarm screaming
jim, May 2014
no need to say thanks

gts, May 2014
turn power off remove cover fit new battery replace cover ,ignore the noise reset the system turn power back on

gts, May 2014
link Click here to see other fixes for Optima.