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BRK Hardwired (with Battery Backup) Ionization Interconnected Combination Smoke and Carbon Monoxide Detector

First Alert BRK Hardwired (with Battery Backup) Ionization Interconnected Combination Smoke and Carbon Monoxide Detector

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Do these units have more than 1 battery ? With power off and 9 volt removed some chirped ?


Thank you for your question. The unit only has one battery. The unit is a hardwired unit that has a 9 volt back up battery. The back up battery is designed to provide coverage for a short time in the event of a power outage. It is not recommended, but the unit can chirp and communicate without the backup battery.

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