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Smoke & CO Detectors · Head to head

Google Nest Protect (Battery) vs Google Nest Protect (Wired)

Full Smart Smoke & CO Detectors comparison in 2026

Updated October 2026
Data from Amazon and official Google site.
2026 verdict
Batteries or house wiring: for most homes the Google Nest Protect (Battery) is the one to buy, because it is the same smoke and CO alarm with no alarm circuit needed.
Google Nest Protect (Battery)
Winner
Google Nest Protect (Battery)
$399.99
Buy on Amazon USACheck price
Both detect smoke and carbon monoxide, speak an early warning, alert your phone, test themselves, light a pathlight, use Steam Check, interconnect wirelessly and work with Google Home and Home Assistant, with the same 2-year warranty. The only real difference is power: the Google Nest Protect (Wired) runs on your home's alarm wiring with 3 AA cells as backup, while the battery model runs on six AA cells rated for about 2 years. The wired version is the better choice where alarm wiring already exists and owners rate it a little higher, largely because it ends battery changes. Buy the Google Nest Protect (Battery) for a home without alarm wiring or a rental, and the Google Nest Protect (Wired) to replace existing hardwired detectors.
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FeatureGoogle Nest Protect (Battery)Google Nest Protect (Wired)Winner
Price$399.99$499.99Google Nest Protect (Battery)
Rating4.44.6Google Nest Protect (Wired)
Warranty2 years2 yearsTie
Connectivity2.4 GHz WiFi, Bluetooth, Other2.4 GHz WiFi, Bluetooth, OtherTie
IntegrationsGoogle Home, Home AssistantGoogle Home, Home AssistantTie
ScreenNONOTie
SensorsSmoke, CO, Occupancy, Temperature, Humidity, Ambient Light, MotionSmoke, CO, Occupancy, Temperature, Humidity, Ambient Light, MotionTie
AlertsFire Alerts, CO Alerts, Low Battery AlertsFire Alerts, CO Alerts, Low Battery AlertsTie
Built-in SirenYESYESTie
Built-in LightYESYESTie
Tests ItselfYESYESTie
PathlightYESYESTie

What the differences mean

Power source

The Google Nest Protect (Battery) runs on six AA cells rated for about 2 years, so you replace a full set periodically. The Google Nest Protect (Wired) draws house power from existing alarm wiring and keeps 3 AA cells only as outage backup, so routine battery changes disappear.

Installation

The Google Nest Protect (Battery) goes on any ceiling with a couple of screws. The Google Nest Protect (Wired) needs an existing alarm circuit, and fitting it means working with mains power switched off at the breaker.

Everything else

Sensors, alerts, self-testing, pathlight, Steam Check, wireless interconnection, Google Home and Home Assistant support, and the 2-year warranty are the same on both. At 379 g against 375 g, even the weight is effectively identical.

Which one to buy if

What owners say

Owners of both versions praise the same core: the spoken warning that names the room before the horn, phone alerts while away, the monthly self-test report, the pathlight and a fast install with a rotating mount. Both groups also share the same complaints: a high price, spoken room names limited to a fixed list, 2.4 GHz Wi-Fi only and no Alexa, HomeKit, SmartThings or Matter. Where they part is power. Google Nest Protect (Battery) owners warn that it needs specific lithium AA cells, that the low-battery warning can arrive abruptly and that old stock eats into its fixed lifespan. Google Nest Protect (Wired) owners single out the end of low-battery chirps, and their own gripe is that it only interconnects with other Nest Protects, not the wired alarms already in the house.

Price history compared

Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.

  • Google Nest Protect (Battery)
  • Google Nest Protect (Wired)

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Frequently Asked Questions

Nest Protect wired vs battery: what is the difference?

Only the power source. The Google Nest Protect (Wired) runs on house alarm wiring with 3 AA backup cells, and the Google Nest Protect (Battery) runs on six AA cells. Both detect smoke and carbon monoxide and share the same sensors, alerts, self-test, pathlight, Steam Check and smart home support.

Which is better: Google Nest Protect (Battery) or Google Nest Protect (Wired)?

The Google Nest Protect (Battery) for most homes, since it does everything the wired model does without needing an alarm circuit. The Google Nest Protect (Wired) is better where hardwired alarm wiring already exists, because it ends routine battery changes.

How long does the Google Nest Protect (Battery) battery last?

The Google Nest Protect (Battery) is rated for about 2 years on its six AA batteries, and owners note it needs specific lithium AA cells rather than alkaline or rechargeable ones. The Google Nest Protect (Wired) uses its 3 AA cells only as backup during power cuts.

What batteries does the Google Nest Protect use?

The Google Nest Protect (Battery) takes six AA cells, and owners report it requires lithium AA batteries. The Google Nest Protect (Wired) holds three AA cells as backup for when house power fails.

Can the Google Nest Protect (Wired) interconnect with my existing wired alarms?

No. Owners report the Google Nest Protect (Wired) only interconnects with other Nest Protects, which it does wirelessly. A home that wants every alarm to sound together needs a Nest Protect in each spot.

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