Smoke & carbon monoxide detectors save lives. It is advised that you should change your batteries twice a year. An easy way to remind yourself is to: "Change your clock, Change your battery." A battery change in your smoke detector & carbon monoxide detector can be the difference between life and death.
About Carbon Monoxide
Carbon Monoxide is an odorless, tasteless, colorless gas that is deadly. It is a by-product of a fuel burning process. It can cause symptoms that can mimic a flu and result in unconsciousness and even death. Many appliances around the home are capable of producing Carbon Monoxide when a fault or unusual condition exists. Since the source may be transient in nature, the source may not always be detectable.