My smoke alarm is connected to the mains electricity. No need for new batteries ... | Hacker News

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		highace on Oct 8, 2013 \| parent \| context \| favorite \| on: Nest introduces their Smoke Detector My smoke alarm is connected to the mains electricity. No need for new batteries ever. Just a simple extension from the power outlets in the attic and down through the ceiling.

joeshaw on Oct 8, 2013 | [–]

In the US, current fire codes require that hardwired smoke detectors also have a battery backup.

http://artisanelectric.net/blog/the-big-picture/how-old-are-...

http://www.nfpa.org/codes-and-standards/document-information...

zwily on Oct 8, 2013 | [–]

They should still have a battery backup.

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