How often should I replace the batteries in my smoke alarm?

Smoke alarms with non-replaceable (long-life) batteries are designed to remain effective for up to 10 years. If the alarm chirps, warning that the battery is low, replace the entire smoke alarm right away. 

For smoke alarms with any other type of battery, replace batteries at least once a year. If the alarm chirps, replace only the battery.

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1. How can you avoid carbon monoxide poisoning?
2. What is the best carbon monoxide alarm to use? Are there different kinds?
3. Where do I install my new carbon monoxide alarm?
4. How often do carbon monoxide alarms need to be changed?
5. Where do I install smoke alarms?
6. How often should I replace the batteries in my smoke alarm?
7. What maintenance do my smoke alarms need?