# X-Sense SD11 Smoke Alarm, 10-Year Sealed Battery

The X-Sense SD11 is a single battery-powered smoke alarm with a photoelectric sensor and a listed battery life of 10 years. Its sealed battery avoids routine battery replacement, while customer feedback is mixed on how long the battery and alarm last in practice.

- [Original product page](https://bargainpostbox.co.uk/product/x-sense-sd11-smoke-alarm-sealed-battery)
- [View offer](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarm-sealed-battery)
- Market: UK
- Language: en-GB
- Currency: GBP
- Brand: X-Sense
- Model: SD11
- Category: Electronics > Smart Home & Security > Alarms & Sensors
- Price: 9.40 GBP
- Previous price: 14.18 GBP
- Discount: 34%
- Price checked: 2026-11-12T15:09:43.456Z
- Rating: 4.5 / 5
- Reviews: 7298

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- Sealed, non-replaceable lithium battery is claimed to last up to 10 years.
- Photoelectric sensing and an intelligent chipset are claimed to detect dangerous smoke levels with fewer false alarms.
- Self-checking is claimed to notify users of faults or low battery.
- The listing claims an 85-decibel alarm and conformity to EN 14604.

## Pros

- Sealed battery means no routine battery changes are described during the stated battery life.
- The listed photoelectric sensor and audible alarm make the core smoke-detection function clear.
- Package details list a mounting bracket, screws, anchor plugs and a user manual.

## Cons

- The battery is described as non-replaceable, so it cannot be changed separately if it runs out early.

## Specifications

### Identity
- Brand: X-Sense
- Model: SD11
- Sensor type: Photoelectric
- Alarm: Audible
- Standard claim: Conforms to EN 14604 Standard, LED Indicator & Silence Button
### Power and battery
- Power configuration: Battery Powered
- Battery life listed: 10 years
### Dimensions and installation
- Dimensions listed: 12.2D x 12.2W x 4.5H centimetres
- Weight listed: 178 Grams
### Materials and protection
- Material listed: ABS
- Operating humidity listed: 85% Volume

## Before you buy

- The 10-year battery life is a listing claim, not a guarantee of service duration. Customer feedback is mixed, with some reporting early battery depletion and shorter-than-expected durability.

## In the box

- 1 × Smoke alarm (Included)
- 1 × Mounting bracket (Included)
- Mounting screws (Included)
- 2 × Anchor plugs (Included)
- User manual (Included)

## A good fit for

- Buyers wanting a standalone, battery-powered smoke alarm with a sealed battery.
- Those looking for a photoelectric sensor and an audible alarm in a one-unit pack.

## Less suited to

- Buyers who need a replaceable battery, smart or app-connected alerts, or confirmed interlinking. Those functions are not stated for this model.

## Customer feedback

Customer feedback highlights perceived quality, straightforward fitting and a loud warning alarm. Battery life and durability receive mixed reports, including accounts of early battery depletion, which matters because the SD11 is listed with a sealed, non-replaceable battery and a 10-year life claim. The generally favourable aggregate ratings should be weighed alongside those reported concerns.
- Positive themes: Customers report that installation is easy and the alarm is loud.
- Mixed feedback: Customer feedback is mixed on battery life and durability, with some reports of early battery depletion.

## Frequently asked questions

### Can the battery be replaced?
The listing describes a built-in non-replaceable lithium battery, with a stated battery life of 10 years.
### What sensing technology does it use?
The SD11 is listed with a photoelectric sensor.
### What is included?
The stated contents list one smoke alarm, one mounting bracket, two screws, two anchor plugs and one user manual.

## Alternative options

- [X-Sense Smoke Alarm for Home with Magnetic Mount, XS0G-SN, 1 Pack \| Standby Without Flashing Light, 10-Year Irreplaceable Battery, Test/Silence Button, Ultra-Thin](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarm-sealed-battery)
- [FireAngel FA6620 Optical, Battery Powered Fire/Smoke Alarms for Home \| 1-Pack, 10-Year Battery Smoke Alarm Detector, Replacing FireAngel ST-622/ST-620, Fire Alarms for Home](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarm-sealed-battery)
- [X-Sense Smart Smoke and Carbon Monoxide Alarm with Voice Alerts, XP0A-MR11 \| Wireless Interlinked English Voice Alarm with SBS50 Base Station](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarm-sealed-battery)
- [Smoke Alarm, 10 Years Battery,Self-Adhesive, No Drilling Require Smoke Alarms for Home, Fire Alarm with Mute Remotely Function,Big Test/Silence Button Smoke Detectors, Conforms EN14604, UKCA \(1 Smoke\)](https://bargainpostbox.co.uk/visit/wisualarm-s05-a-smoke-alarm)
- [Kidde 10Y29 RB Ten Year Life Sealed Battery Smoke Alarm , White](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarm-sealed-battery)
- [Smoke Alarms for Home, 10-Year Battery, Smoke Alarm, Fire Alarm with Test/Silence Button, Smoke Detector Certificated by TUV Conforms to EN14604 Standard \(1pcs\)](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarm-sealed-battery)
- [FireAngel SW1-R Mains Smoke Alarm/Detector for Home with Backup Battery \| 1-Pack, Interlinked, Hard Wired Smoke Alarms for Home with Test Button and LED Indicators](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarm-sealed-battery)
- [X-Sense 2 Pack Smoke Alarm for Home, 10-Year Battery and Lifespan, XS0G-SN \| Conforms to EN 14604 Standard, Test/Silence Button, Standby Without Flashing Light, Ultra-Thin](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarm-sealed-battery)
- [Smoke Alarms for Home Pre-connected,10 Years Battery Life,Interlinked Smoke Alarms, Fire Alarms for Home Scotland Interlinked,Smoke Detector,Compliant with EN14604, CE Certified](https://bargainpostbox.co.uk/visit/wisualarm-s04-r8-three-piece-interlinked-smoke-alarms)
- [Smoke Alarm 10 Years Lifepan, 5 Years Battery, Smoke alarms for Home, with Replaceable Battery, Fire Alarm Test/Silence Button, Smoke Detector, 85dB, Conforms to EN14604, UKCA \(1PCS\)](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarm-sealed-battery)

## Add-ons

- [X-Sense Wi‑Fi Smoke and Carbon Monoxide Alarm, App Control, SC07-WX, 1-Pack \| with Replaceable Battery, Smart Fire Alarm Comp](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarm-sealed-battery)
- [X-Sense Wi-Fi Smoke and Carbon Monoxide Alarm, Voice Alerts, XP0A-iR,2-Pack \| with Replaceable Battery, Compatible with X-Sen](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarm-sealed-battery)

## Images

![X-Sense SD11 Smoke Alarm, 10-Year Sealed Battery — 1](https://bargainpostbox.co.uk/i/UgIkRughw4_hLM5WCJ7w6vFHQdUzx0ZBR15F6dvJgRJE25H6VcY2YeszZX6Gmw0nbjh8UmUYJVVKKq4ZqXQArS88GJ0ye6nAjixX56EJUHbYk3msOY5rap2v.jpg)

![X-Sense SD11 Smoke Alarm, 10-Year Sealed Battery — 2](https://bargainpostbox.co.uk/i/akob2iwlfyAZ9WyZkYi4q-k-DuHgQXYz3gChLwlfmlYdFCgr97L18HgauXQA46HvCBj72l8B2z8ebT6HSjxuptJpgPvhAnLn50CUyfwnSigEUG5Aw0rS09KN.jpg)

![X-Sense SD11 Smoke Alarm, 10-Year Sealed Battery — 3](https://bargainpostbox.co.uk/i/4Yd5N5R_baOM4-S3-Z41TDwg5n3X-HtXkE2kEgTUajSKJtJt0i9pwqzaCkI8shWgbvBHB_VOCydsj6M64rUQpFCRHACcW15QlXi64ywZIqvEONwn2v3dq2Et.jpg)

![X-Sense SD11 Smoke Alarm, 10-Year Sealed Battery — 4](https://bargainpostbox.co.uk/i/u62nLBBecogRBei3SdD44JSVt4-foztFu7OmmOXPqZr3Yl3XWz3TgcWcZaA27gHuHiu8cI9MXJS7z3RNU8bIbbgtf2DGB6K5EHkQYISLwuVjCwQOYDjPBLv5.jpg)

![X-Sense SD11 Smoke Alarm, 10-Year Sealed Battery — 5](https://bargainpostbox.co.uk/i/COH2HbFbDFe2bVyzlwY7ZKxk8LCVX39LoSxRDNzK108wGtn9dLvYqjtKRCAc1wTgwOtSWGOaHKoWg7Z_btVt1UYzywYsS-hsImdvpvZrW3W0OTfNn7FDEhsl.jpg)

![X-Sense SD11 Smoke Alarm, 10-Year Sealed Battery — 6](https://bargainpostbox.co.uk/i/iOGF1c1anrkKgUa26oAALhcd1FSzaPdfNVDDqm-PkignSxRYdcCPIRH0J3z2xihCPkutxccZ-FHyqCutFICFZidsoUzFxLisxR-_IHUhv5UDo8dh3BsSQ6hp.jpg)

![X-Sense SD11 Smoke Alarm, 10-Year Sealed Battery — 7](https://bargainpostbox.co.uk/i/POW68-d-mD4wCf6YPjjIVDy5RPHUF9utOM7D1E6WGJqnygFR_EZJWpxdI5yURpLSLUTjMo7hdLg_x_LTokmZILj7pc7xXuiL9teg6OKnbXOb3d2ZcdnqM2do.jpg)