Xiaomi Watch S4: specs, who it fits and compatible phones
Xiaomi Watch S4 is a smartwatch released in 2025 that works with iPhone and Android. It lists Dual-band GNSS, 5ATM and SpO2, HRV.
Specifications
| Release year | 2025 |
|---|---|
| Case size | 47 mm |
| Display | AMOLED |
| Brightness | 1500 nits (approx.) |
| Battery as listed | Up to 15 days |
| Water rating | 5ATM |
| Case material | Aluminum |
| GPS type | Dual-band GNSS |
| Operating system | Xiaomi HyperOS 2 |
| Works with | iPhone and Android |
| Plan needed | None |
| Health sensors | SpO2, HRV, Skin temperature |
| Safety features | SOS, Fall detection |
Who it fits
- Works with iPhone and Android.
- Lists a battery above the median of 89 listed smartwatch models.
- Lists SOS or fall detection, see our guide for older adults.
How it compares
Closest models from Xiaomi
| Model | Release year | Case size | Battery as listed | Water rating | GPS type | Works with |
|---|---|---|---|---|---|---|
| Xiaomi Watch S4 41mm | 2025 | 41 mm | Up to 8 days light use ยท 4 days regular | 5ATM | Dual-band GNSS | iOS and Android |
| Xiaomi Watch S5 | 2026 | 46 mm | 12 days (user-measured) (approx.) | 5ATM | Dual-band GNSS | iOS and Android |
| Xiaomi Watch S1 Active | 2022 | 46.5 mm | Up to 12 days | 5ATM | Dual-band GNSS | iOS and Android |
Closest models from other brands
| Model | Release year | Case size | Battery as listed | Water rating | GPS type | Works with |
|---|---|---|---|---|---|---|
| Amazfit Balance 2 | 2025 | 47 mm | Up to 21 days | 5ATM | Dual-band GNSS + maps | iOS and Android |
| Amazfit Bip 6 | 2025 | 46.3 mm | Up to 14 days | 5ATM | Dual-band GNSS | iOS and Android |
| OnePlus Watch Lite | 2025 | 45 mm | Up to 10 days | 5ATM (approx.) | Dual-band GNSS | iOS and Android |
Compared with Xiaomi Watch S4 41mm, Xiaomi Watch S4 lists a larger case (47 mm against 41 mm) and Aluminum case material, where Xiaomi Watch S4 41mm lists Stainless steel.
Compared with Xiaomi Watch S5, Xiaomi Watch S4 lists an older release year (2025 against 2026).
Compared with Xiaomi Watch S1 Active, Xiaomi Watch S4 lists a longer listed battery (15 days against 12), a newer release year (2025 against 2022) and Aluminum case material, where Xiaomi Watch S1 Active lists Reinforced polymer.
Compared with Amazfit Balance 2, Xiaomi Watch S4 lists a shorter listed battery (15 days against 21).
Compared with OnePlus Watch Lite, Xiaomi Watch S4 lists a longer listed battery (15 days against 10) and Aluminum case material, where OnePlus Watch Lite lists Polished stainless steel.
Only values listed exactly are compared.
Position in the catalog
Its listed battery of 15 days is above 74% of 46 smartwatches with a single plain days value. Its case size of 47 mm is larger than 69% of 52 smartwatches with a single exact size. Its exact water rating of 5ATM is above 4% of 78 smartwatches with a single exact ATM rating. It was released in 2025. Among 128 smartwatches with an exact release year, 91% were released in 2025 or earlier and 27% were released in 2025 or later.
Phone compatibility and plan
No plan is listed as needed.
Sensors and features are listed as the maker names them and are not medical measurements.
Related guides and lists
- Battery life explained
- Phone compatibility
- Water resistance ratings
- Sensors explained
- Xiaomi smartwatches
- All models
Last verified September 26, 2026
Features change with updates. Check the maker's current details. See our methodology