# Which smart smoke detector has the longest battery life? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

Which smart smoke detector has the longest battery life?

## Products

### X-Sense Interconnected Wireless Smoke and CO Detector
```yaml
product: x-sense-interconnected-wireless-smoke-and-co-detector
brand: X-Sense
price_gbp: 33.2
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
alarm_volume: 85
battery_life: 10
connectivity: Wireless RF 869.25-869.3 MHz
temperature_range: 4.4-37.8°C
carbon_monoxide_detection: Electrochemical sensor; 50 ppm, 100 ppm, and 300 ppm detection levels
```

- **Price:** £33.2 [^1]
- **Summary:** The X-Sense SC07-W is a wireless interconnected detector combining photoelectric smoke detection with electrochemical carbon monoxide detection. Its sealed 10-year lithium battery and ability to connect with up to 24 compatible alarms make it suitable for whole-home protection without hardwiring or an app.
- **Ideal For:** This product suits the question because its sealed 10-year battery provides long-term operation without battery replacement, making it a strong choice for longest battery life among interconnected detectors.

### Kidde P4010DCS-W (Kidde 10-Year Worry-Free Battery Powered Interconnected Smoke Detector with Voice Alerts, 2-Pack)
```yaml
product: kidde-p4010dcs-w-kidde-10-year-worry-free-battery-powered-interconnected-smoke-detector-with-voice-alerts-2-pack
brand: Kidde
price_gbp: 42.1
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
alarm_volume: 85
battery_life: 10
connectivity: Radio frequency wire-free interconnectivity
```

- **Price:** £42.1 [^2]
- **Summary:** This Kidde kit includes two 10-year, sealed-battery smoke alarms with voice alerts. The alarms are interconnected wire-free using a proprietary radio signal, so connected units sound when one alarm detects smoke. They also provide supervised interconnect so the system can alert if an alarm loses connection.
- **Ideal For:** For the longest battery life, choose this Kidde model because it uses a sealed 10-year lithium battery with no battery replacement during the alarm's life.
- **Additional Sources:** [^3]

### First Alert SC5 Smart Smoke and Carbon Monoxide Alarm Battery Powered
```yaml
product: first-alert-sc5-smart-smoke-and-carbon-monoxide-alarm-battery-powered
brand: First Alert
price_gbp: 95.9
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
alarm_volume: 85 dB at 10 ft
connectivity: Wi-Fi
carbon_monoxide_detection: true
```

- **Price:** £95.9 [^4]
- **Summary:** The battery-powered SC5 is a smart combination smoke and carbon monoxide alarm with photoelectric and electrochemical sensors, voice alerts, wireless interconnectivity, and mobile notifications through the First Alert and Google Home apps. It suits households seeking app-connected fire and CO monitoring without hardwiring, especially those replacing Google Nest Protect alarms.
- **Ideal For:** It is a strong fit for someone seeking a smart smoke detector with long battery life because it uses six replaceable 3V lithium CR123A batteries, though the manufacturer does not state a battery-life duration.
- **Additional Sources:** [^5]

### First Alert SM210V 10-Year Battery Smoke Alarm with Voice Alerts
```yaml
product: first-alert-sm210v-10-year-battery-smoke-alarm-with-voice-alerts
brand: First Alert
price_gbp: 33.19
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
alarm_volume: 85
battery_life: 10
```

- **Price:** £33.19 [^6]
- **Summary:** The First Alert SM210V is a photoelectric smoke alarm with a sealed 10-year lithium battery, voice and location alerts, Precision Detection technology, and an end-of-life warning. It suits homeowners who want long-lasting, low-maintenance smoke protection without hardwiring or battery replacements.
- **Ideal For:** This product suits the question Which smart smoke detector has the longest battery life because its sealed lithium battery lasts 10 years and it adds voice and location alerts for easier emergency guidance.

### X-Sense XP0A-iR Smart Smoke and CO Detector
```yaml
product: x-sense-xp0a-ir-smart-smoke-and-co-detector
brand: X-Sense
price_gbp: 27.29
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
alarm_volume: 85
battery_life: 1
connectivity: 2.4 GHz Wi-Fi
temperature_range: 40-100°F
carbon_monoxide_detection: Electrochemical sensor
```

- **Price:** £27.29 [^7]
- **Summary:** This smart combination detector uses photoelectric smoke sensing and electrochemical carbon monoxide detection, with app alerts over 2.4 GHz Wi-Fi. It suits homeowners who want remote notifications, voice alerts, a real-time CO display, and a replaceable battery.
- **Ideal For:** It is not ideal for the question of longest battery life because its replaceable CR123A battery lasts 1 year under weekly testing.

### Kidde RGCUAR-RW Ring App Enabled Smart Smoke and Carbon Monoxide Detector
```yaml
product: kidde-rgcuar-rw-ring-app-enabled-smart-smoke-and-carbon-monoxide-detector
brand: Kidde
price_gbp: 55.32
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
alarm_volume: 85 dB at 10 ft
connectivity: Wi-Fi
temperature_range: 40°F to 100°F
carbon_monoxide_detection: Electrochemical sensor
```

- **Price:** £55.32 [^8]
- **Summary:** This hardwired smart detector uses two AA batteries for backup and connects to the Ring App over 2.4 GHz Wi-Fi. It detects both smoke and carbon monoxide, provides real-time notifications and voice alerts, and suits homeowners who want smart monitoring with whole-home interconnectivity.
- **Ideal For:** It suits the question because its hardwired design provides continuous power, while two AA backup batteries maintain protection during short-term outages, although a battery-life figure in years was not found.
- **Additional Sources:** [^9]

### X-Sense SC07 Wireless Smoke and Carbon Monoxide Alarm
```yaml
product: x-sense-sc07-wireless-smoke-and-carbon-monoxide-alarm
brand: X-Sense
price_gbp: 31.73
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
alarm_volume: 85
battery_life: 10
connectivity: Standalone
temperature_range: 40-100°F (4.4-37.8°C)
carbon_monoxide_detection: 70 ppm for 60-240 minutes; 150 ppm for 10-50 minutes; 400 ppm for 4-15 minutes
```

- **Price:** £31.73 [^10]
- **Summary:** The X-Sense SC07 is a standalone combination alarm with a 10-year sealed battery, photoelectric smoke detection, electrochemical carbon monoxide detection, and an LCD that displays real-time CO concentration. It suits homeowners who want long-term fire and CO protection without replacing batteries or setting up a wireless network.
- **Ideal For:** This model suits the search for a smart smoke detector with the longest battery life because it provides 10 years of battery life, although its standalone design does not provide app or Wi-Fi connectivity.

### Kidde 30CUD10-V DETECT Combo Smoke and CO Alarm, 10-Year Battery Powered
```yaml
product: kidde-30cud10-v-detect-combo-smoke-and-co-alarm-10-year-battery-powered
brand: Kidde
price_gbp: 51.63
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
alarm_volume: 85
battery_life: 10
temperature_range: 40°F to 100°F
carbon_monoxide_detection: Electrochemical sensor
```

- **Price:** £51.63 [^11]
- **Summary:** This battery-powered combination alarm detects both smoke and carbon monoxide and includes voice alerts that identify the danger. Its sealed 10-year battery, self-testing, and reduced nuisance alarms make it suitable for residential living spaces where low maintenance is important.
- **Ideal For:** It suits shoppers seeking the smart smoke detector with the longest battery life because its sealed battery is designed to last 10 years while providing smoke and electrochemical carbon monoxide detection.
- **Additional Sources:** [^12]

### First Alert SC5 Smart Smoke and Carbon Monoxide Alarm Hardwired
```yaml
product: first-alert-sc5-smart-smoke-and-carbon-monoxide-alarm-hardwired
brand: First Alert
price_gbp: 95.19
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
alarm_volume: 85 dB at 10 ft
connectivity: Wi-Fi
temperature_range: 40°F to 100°F
carbon_monoxide_detection: Electrochemical sensor
```

- **Price:** £95.19 [^13]
- **Summary:** The First Alert SC5 is a hardwired smart combination smoke and carbon monoxide alarm with a 3V lithium battery backup, Wi-Fi connectivity, mobile alerts, voice warnings, and interconnect capability. It suits homeowners replacing compatible Nest Protect alarms or building a connected home safety system.
- **Ideal For:** It suits buyers who want continuous hardwired protection with lithium battery backup, but it cannot be confirmed as the smart smoke detector with the longest battery life because no battery-life rating was found.
- **Additional Sources:** [^14], [^15]

### First Alert SMI110 10-Year Battery Smoke Alarm
```yaml
product: first-alert-smi110-10-year-battery-smoke-alarm
brand: First Alert
price_gbp: 19.89
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
alarm_volume: 85
battery_life: 10
connectivity: None
carbon_monoxide_detection: false
```

- **Price:** £19.89 [^16]
- **Summary:** The First Alert SMI110 is a standalone ionization smoke alarm with a sealed 10-year lithium battery, Precision Detection technology, and a test and silence button. It suits homeowners who want simple installation, no battery replacements, and reliable smoke protection without smart-home connectivity or carbon monoxide detection.
- **Ideal For:** This model suits someone seeking the longest battery life because its sealed lithium battery lasts 10 years, although it is not a smart smoke detector and has no app or wireless connectivity.
- **Additional Sources:** [^17]

### DETECT 20SD10 (DETECT Smoke Alarm, 10-Year Battery Powered)
```yaml
product: detect-20sd10-detect-smoke-alarm-10-year-battery-powered
brand: DETECT
price_gbp: 23.96
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
alarm_volume: 85
battery_life: 10
temperature_range: 40 to 100 F (4.4 to 37.8 C)
```

- **Price:** £23.96 [^18]
- **Summary:** This is a DETECT smoke alarm with a sealed 10-year battery, designed to avoid battery replacements for the life of the device. It uses photoelectric smoke sensing and includes fast alerts with an 85 dB alarm and multi-color LED status. It suits homes needing reliable, long-life smoke detection without wiring.
- **Ideal For:** For the longest battery life, the DETECT 20SD10 is a sealed 10-year battery smoke alarm with no battery changes for 10 years.
- **Additional Sources:** [^19], [^20]

---
## References & Sources
[^1]: The Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/X-SENSE-10-Year-Battery-Wireless-Interconnected-Smoke-and-Carbon-Monoxide-Detector-with-LCD-Display-and-LED-Light-1-Pack-SC07-W/340948900
[^2]: Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/Kidde-10-Year-Worry-Free-Battery-Powered-Interconnected-Smoke-Detector-with-Voice-Alerts-2-Pack-P4010DCS-W-21028749/302682495
[^3]: Crown Supply, accessed 2026-09-13. https://www.crownsupply.com/itemdetail/04787127308
[^4]: The Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/First-Alert-SC5-Battery-Smart-Smoke-and-Carbon-Monoxide-Alarm-FSMCO600NVCL1/337593875
[^5]: Best Buy, accessed 2026-09-13. https://www.bestbuy.com/product/first-alert-smoke-and-carbon-monoxide-detector-battery-powered-white/JJ8Z8VQ4FV/sku/6633004
[^6]: Lowe's, accessed 2026-09-13. https://www.lowes.com/pd/First-Alert-FA-10YR-BATT-PHOTO-SMK-W-VOICE-8E/5014520195
[^7]: X-Sense, accessed 2026-09-13. https://www.x-sense.com/products/x-sense-wifi-smoke-and-co-detector-xp0a-ir
[^8]: The Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/Kidde-Hardwired-Smart-Smoke-and-CO-Detector-Plus-AA-Battery-Ring-App-Enabled-Wireless-Interconnect-Voice-Alerts-RGCUAR-RW-21033275/334373575
[^9]: Newegg, accessed 2026-09-13. https://www.newegg.com/kidde-rgcuar-rw/p/09H-01RJ-00217
[^10]: The Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/X-SENSE-10-Year-Battery-Smoke-and-CO-Alarm-with-LCD-Display-and-LED-Light-1-Pack-SC07-SC07/340947462
[^11]: The Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/Kidde-10-Year-Battery-Powered-Smoke-and-Carbon-Monoxide-Detector-with-Voice-Alerts-30CUD10-V-21032779/328175570
[^12]: WebstaurantStore, accessed 2026-09-13. https://www.webstaurantstore.com/kidde-detect-series-30cud10-v-battery-powered-smoke-and-carbon-monoxide-alarm-with-voice-alert-and-10-year-battery-21032779/47221032779.html
[^13]: Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/First-Alert-SC5-Hardwire-Smart-Smoke-and-Carbon-Monoxide-Alarm-FSMCO600NVACCL1/337593929
[^14]: Abt, accessed 2026-09-13. https://www.abt.com/First-Alert-SC5-Hardwire-Smart-Smoke-and-Carbon-Monoxide-Alarm-FATFSMCO600NVA/p/237990.html
[^15]: Office Depot, accessed 2026-09-13. https://www.officedepot.com/a/products/7987642/First-Alert-SC5-Hardwire-Smart-2/
[^16]: First Alert Store, accessed 2026-09-13. https://www.firstalertstore.com/store/products/first-alert-10-year-sealed-battery-smoke-alarm-smi110.htm
[^17]: Tractor Supply Co., accessed 2026-09-13. https://www.tractorsupply.com/tsc/product/first-alert-sealed-10-year-battery-smoke-alarm-6126828
[^18]: Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/Kidde-10-Year-Battery-Powered-Smoke-Detector-with-Photoelectric-Sensor-20SD10-21031466/328119795
[^19]: Friedman's Home Improvement, accessed 2026-09-13. https://www.friedmanshome.com/detect-smoke-alarm-with-10-year-battery-2000032716
[^20]: Buyrite Electric, accessed 2026-09-13. https://buyriteelectric.com/products/kidde-20sd10-detect-smoke-alarm-10-year-battery-powered