In the Wired article[1], there is a graphic that states battery life is seven years, and the batteries can be replaced for $10-$15 off the shelf. [1] http://ww

In the Wired article[1], there is a graphic that states battery life is seven years, and the batteries can be replaced for $10-$15 off the shelf. [1] http://www.wired.com/business/2013/10/nest-smoke-detector/all/ http://www.wired.com/business/2013/10/nest-smoke-detector/al...