How often should I change the battery in my smoke detector?

Batteries in smoke detectors should be changed twice a year, it is easy to remember that when you change your clocks to change your smoke detector battery also.

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1. How often should I change the battery in my smoke detector?
2. What should I do if my Carbon Monoxide Defector goes off?
3. What should I do if my fire alarm goes off in my home or commercial building that I work or visit?