Having CO and smoke detectors running on main power has it's pros and cons. Sure, you don't have to replace batteries, but if the power somhow goes out, you loose the detectors, too.
Should a fire destroy the power cabling (or an electrical malfunction causes a short circuit and burning cables) you won't hear anything.
Most of todays fires not caused by arson are mainly caused by electric malfunctions / overheating. To rely on main power for a fire alarm (smoke or CO) doesn't appeal to me.
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