A rapid loss of battery power has prompted First Alert to recall nearly 146,000 of its smoke and combination smoke/carbon
monoxide alarms, including a model tested by Consumer Reports. If the batteries become depleted, the alarm won't sound in the event of a fire or if deadly carbon monoxide is present.
Consumer Reports tested the SCO500 model in the September 2005 report on CO alarms (available to subscribers). It is an interconnecting smoke and carbon-monoxide detection alarm that automatically triggers other alarms in the home
via radio waves. The SCO500 was the first battery-powered interconnecting alarm. Before that, such models had to be hard-wired
into a home's electrical or security systems.