Balance 2 vs Xiaomi Watch S4
Verified 2026-10-04
A factual specification comparison between the Balance 2 and the Xiaomi Watch S4.
Image: Zepp Health Corporation
Amazfit · SmartwatchBalance 2
- Status
- Released · 2025-06-01
- Verification
- Verified
- Last checked
- Checked 2026-10-04
Image: Xiaomi Corporation
Xiaomi · SmartwatchXiaomi Watch S4
- Status
- Released · 2025-02-01
- Announced
- Announced 2025-02-01
- Verification
- Verified
- Last checked
- Checked 2026-10-03
Key differences
SpecificationBalance 2Xiaomi Watch S4
Design & Build
| Specification | Balance 2 | Xiaomi Watch S4 |
|---|---|---|
| Water resistance (differs) | 10 ATM | 5ATM |
| Case dimensions (differs) | 47.4 x 47.4 x 12.3 mm | 47.3mm x 47.3mm x 12.0mm |
Display
| Specification | Balance 2 | Xiaomi Watch S4 |
|---|---|---|
| Display (differs) | 1.5-inch AMOLED, 480x480, 323 ppi, sapphire glass protection, up to 2,000 nits | 1.43-inch AMOLED display with HBM brightness |
| Peak brightness (nits) (differs) | 2000 | 1500 |
Battery & Charging
| Specification | Balance 2 | Xiaomi Watch S4 |
|---|---|---|
| Battery capacity (mAh) (differs) | 658 | 486 |
| Battery life (differs) | Up to 21 days typical use | Up to 15 days of typical usage |
Connectivity
| Specification | Balance 2 | Xiaomi Watch S4 |
|---|---|---|
| Bluetooth (differs) | Bluetooth 5.2 | Bluetooth 5.3 |
Software
| Specification | Balance 2 | Xiaomi Watch S4 |
|---|---|---|
| Operating system at launch (differs) | Zepp OS 5 | Xiaomi HyperOS 2 |
Security & Sensors
| Specification | Balance 2 | Xiaomi Watch S4 |
|---|---|---|
| Health sensors (differs) | Optical heart rate, SpO2, temperature, barometric altimeter, geomagnetic sensor | Heart rate sensor (with blood oxygen/SpO2 sensor), Accelerometer, Gyroscope, Ambient light sensor, Electronic compass, Barometer sensor, Hall sensor |
These are specifications where both devices have a confirmed value and the values differ. A difference is not a judgement that either device is better.
Full specifications
differs · Not disclosed: not published by the manufacturer · —: not recorded
SpecificationBalance 2Xiaomi Watch S4
Design & Build
2 differences
| Specification | Balance 2 | Xiaomi Watch S4 |
|---|---|---|
| Water resistance (differs) | 10 ATM | 5ATM |
| Colors | Not recorded | Silver, Black, Rainbow (bezel and strap kit standard), Dual-Tone Ceramic Blue-gray (special edition) |
| Weight | 43 g (without strap) | Not disclosed |
| Case dimensions (differs) | 47.4 x 47.4 x 12.3 mm | 47.3mm x 47.3mm x 12.0mm |
| Build materials | Not recorded | Aluminum alloy frame |
Display
2 differences
| Specification | Balance 2 | Xiaomi Watch S4 |
|---|---|---|
| Display (differs) | 1.5-inch AMOLED, 480x480, 323 ppi, sapphire glass protection, up to 2,000 nits | 1.43-inch AMOLED display with HBM brightness |
| Peak brightness (nits) (differs) | 2000 | 1500 |
Memory & Storage
No differences
| Specification | Balance 2 | Xiaomi Watch S4 |
|---|---|---|
| Storage (GB) | 32 | Not disclosed |
Battery & Charging
2 differences
| Specification | Balance 2 | Xiaomi Watch S4 |
|---|---|---|
| Charging time | Not recorded | 2-pin magnetic charging dock; 5 minutes of fast charging delivers 2 days of usage |
| Battery capacity (mAh) (differs) | 658 | 486 |
| Battery life (differs) | Up to 21 days typical use | Up to 15 days of typical usage |
Connectivity
1 difference
| Specification | Balance 2 | Xiaomi Watch S4 |
|---|---|---|
| Wi-Fi | 2.4GHz Wi-Fi | Not disclosed |
| Bluetooth (differs) | Bluetooth 5.2 | Bluetooth 5.3 |
| Contactless payments | Not recorded | NFC supported (availability varies by region) |
| Positioning | Not recorded | Dual-frequency GNSS chip: GPS, Galileo, GLONASS, BeiDou, QZSS (5 satellite systems) |
Software
1 difference
| Specification | Balance 2 | Xiaomi Watch S4 |
|---|---|---|
| Operating system at launch (differs) | Zepp OS 5 | Xiaomi HyperOS 2 |
| Phone compatibility | Not recorded | Requires a Xiaomi smartphone or pad running Xiaomi HyperOS 2 with the Mi Fitness app for full feature support (including Xiaomi Smart Hub) |
Security & Sensors
1 difference
| Specification | Balance 2 | Xiaomi Watch S4 |
|---|---|---|
| Health sensors (differs) | Optical heart rate, SpO2, temperature, barometric altimeter, geomagnetic sensor | Heart rate sensor (with blood oxygen/SpO2 sensor), Accelerometer, Gyroscope, Ambient light sensor, Electronic compass, Barometer sensor, Hall sensor |
Terms used on this page (3)
- ppi
- Pixels per inch: how densely pixels are packed on the screen.
- Nits
- A unit of screen brightness (candela per square metre). Typical, HDR and outdoor peak figures are measured under different conditions.
- mAh and Wh
- Battery capacity. mAh is charge; Wh also accounts for voltage, so it is the more comparable energy figure across device types.
Sources & verification
Xiaomi Watch S4
Verified 2026-10-03- Xiaomi CorporationManufacturer specificationsTier 1
Tier 1 sources are the manufacturer's own product pages, technical specification sheets, or support documentation. Tier 2 sources are reputable independent technical references, used only for facts that couldn't be confirmed from official documentation.