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Roost Smart Battery review: This is the best smoke-alarm battery you can buy

Michael Brown | Nov. 12, 2015
Few life events are more annoying than being awakened at 3AM by a chirping smoke alarm. But the alternative—waking up to a house engulfed in flames because you didn’t know the battery in your smoke alarm died—is far worse. The Roost Smart Battery neatly solves this problem.

Roost Smart Battery (front)

Few life events are more annoying than being awakened at 3AM by a chirping smoke alarm. But the alternative—waking up to a house engulfed in flames because you didn’t know the battery in your smoke alarm died—is far worse. The Roost Smart Battery neatly solves this problem by sending an alert to your smartphone well before the battery reaches the level that prompts the alarm to chirp. But that’s the least-important benefit the Roost Smart Battery delivers.

The Roost will also send alerts to you—and to as many additional people as you can recruit to be in your Home Circle—when the accumulation of smoke or carbon monoxide triggers the detector it's installed in (those folks will need to accept your invitation and install the Roost app on their own smartphone). This alert message, complete with the sound of a klaxon, includes the phone number for your local emergency responder, so you can quickly summon help. How does it accomplish this trick? The battery is equipped with a tiny Wi-Fi transmitter that talks to your wireless router.

And for those times when you burn something on the stove and the smoke alarm goes into a tizzy? Whip out your smartphone and hit the “snooze” button. It will turn the off the alarm and send a message to your contact list to let them know everything is okay. The alarm will sound again if smoke continues to accumulate. The battery itself is the exact same size as a normal 9-volt battery—it has to be to fit in the devices it needs to power.

Roost Smart Battery (Wi-Fi module) 
When the Roost battery nears the end of its five-year life, just pull off the Wi-Fi module and attach it to a new battery.  Credit: Michael Brown

I must say I wasn’t as impressed with the Roost Smart Battery when I first heard about it more than a year ago. In the original design, you simply tossed the $35 battery in the garbage at the end of its five-year life (a longevity feat made possible by a sophisticated power-management algorithm). Fortunately, that’s not the design that reached the market. When this battery dies, you simply detach the tiny Wi-Fi module from the dead battery and snap it onto the $15 replacement battery—which will run for another five years (repeat ad infinitum). That makes this device much more compelling than the product that was originally announced.

How it works

It took me just a little longer than the five minutes Roost says is needed to install the battery. The first step is to install the app (there are Android and iOS versions) on your smartphone. You then use the app to pair the battery with your phone, and in turn, with your Wi-Fi network. You then plug the battery into your smoke detector.

 

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