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Re:Meet the Nest Protect smoke and CO alarm by uptown on Tuesday October 08, 2013 @09:53AM (#6514866)
According to the site - for the battery-powered version:

"6 AA Energizer Ultimate Lithium batteries Long-life batteries designed for multi-year operation"

and for the wired version:

"3 AA Energizer Ultimate Lithium backup batteries Long-life backup batteries designed for multi-year operation"

I suppose it depends how much you use its features like lighting-up your hallway, but that's more-than reasonable in my opinion.

Re:Meet the Nest Protect smoke and CO alarm by raverbashing on Tuesday October 08, 2013 @11:27AM (#6515588)
I really wished they had innovated in that sense

For example with a wireless energy transmitter (it doesn't need to be too powerful).

Or "solar powered" with a good set of (rechargeable) batteries.