Smoke and Carbon Detector Alarm

Hi, wondered if anyone had a definitive answer as to whether the cardon and smoke detector alarm have to be mains powered? If this is correct can this be changed when a new tenant goes in or would all properties need to be changed immediately? Many thanks

They can legally be battery operated, altbough some licence conditions stipulate mains.

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I have electric smoke detectors in 2 properties and battery in another. All have battery co2 alarms.