Aqara Smart Smoke Detector vs Google Nest Protect (Battery)

The Google Nest Protect (Battery) is better overall as a safety alarm because it detects both smoke and carbon monoxide, packs extra sensors, tests itself, and delivers spoken early warnings, alongside a higher owner rating and longer warranty. The Aqara Smart Smoke Detector wins on price, a longer 10-year battery rating and broader HomeKit and Matter integrations, but it detects smoke only.

The biggest difference is scope. The Google Nest Protect (Battery) is a full smoke-and-CO alarm with occupancy, temperature, humidity, light and motion sensing, self-test and a pathlight, while the Aqara Smart Smoke Detector is a focused smoke-only Zigbee sensor built for HomeKit, Home Assistant, IFTTT and Matter automations.

The Aqara Smart Smoke Detector is rated for a 10-year battery life on its CR17450 cell, though some owners report shorter real-world drain. The Google Nest Protect (Battery) runs on 6 AA batteries rated for about 2 years, so the Aqara wins on rated battery longevity while the Nest trades that for far more sensing and features.

They lean different ways. The Aqara Smart Smoke Detector supports Apple HomeKit, Home Assistant, IFTTT and Matter over Zigbee but not Alexa or Google Home. The Google Nest Protect (Battery) works with Google Home and Home Assistant but not Alexa, HomeKit, SmartThings or Matter, so your existing ecosystem should decide the pick.

Buy the Google Nest Protect (Battery) if you want combined smoke and carbon monoxide protection with spoken early warnings, phone alerts, self-testing and a pathlight, and you live in a Google or Nest household without hardwired alarm wiring.

Buy the Aqara Smart Smoke Detector if you want the more affordable unit with a longer 10-year battery rating, already run a Zigbee, Apple HomeKit or Matter home, and want smoke detection folded into automations rather than combined smoke-and-CO hardware.