Galaxy Watch Ultra (2025) vs Xiaomi Watch S4 41mm
Which one should you buy?
Who leads where?
- DisplayGalaxy Watch Ultra (2025)
- CaseXiaomi Watch S4 41mm
Wins are counted from the official values in the table below; the BUY / CONSIDER / WAIT call comes from each product's own decision box. We do not predict prices.
The differences in short
Case Size: Galaxy Watch Ultra (2025) 47 mm, Xiaomi Watch S4 41mm 41.2 mm. Xiaomi Watch S4 41mm leads on Battery Life: up to 96 hours against up to 60 hours. Water Resistance: Galaxy Watch Ultra (2025) 10 ATM, Xiaomi Watch S4 41mm 5 ATM.
Which one for what you do?
Health Tracking
Galaxy Watch Ultra (2025)
77% – 69%
Sport & Outdoors
Xiaomi Watch S4 41mm
67% – 64%
Battery Life
Xiaomi Watch S4 41mm
64% – 50%
Daily Use
Xiaomi Watch S4 41mm
68% – 65%
The percentages are Kacbu Match scores: computed from official specifications for that use, with no price in them.
 SamsungGalaxy Watch Ultra (2025)No reviews yet |  XiaomiXiaomi Watch S4 41mmNo reviews yet | |
|---|---|---|
| Key Differences | ||
| Case Size | 47 mm | 41.2 mm |
| Battery Life | up to 60 hours | up to 96 hours |
| ECG App | Yes | No data |
| Water Resistance | 10 ATM | 5 ATM |
| Health Sensors and Features | ||
| Heart Rate Sensor | Yes | Yes |
| SpO2 Sensor | Yes | Yes |
| ECG Sensor | Yes | No data |
| Skin Temperature Sensor | Yes | Yes |
| ECG App | Yes | No data |
| Atrial Fibrillation Notification | Yes | No data |
| Sleep Tracking | Yes | No data |
| Fall Detection | Yes | No data |
| Display | ||
| Size | 1.5" | 1.32" |
| Panel | Super AMOLED | AMOLED |
| Resolution | 480x480 | 466x466 |
| Peak Brightness | 3000 nit | 1500 nit |
| Always-On Display | Yes | No data |
| Case | ||
| Case Size | 47 mm | 41.2 mm |
| Case Thickness | 12.1 mm | 9.5 mm |
| Weight | 60.5 g | 32 g |
| Case Material | Titanium | Stainless steel |
| Positioning and GNSS | ||
| GNSS Receiver | Yes | Yes |
| Dual-Band GNSS | Yes | No data |
| GNSS Systems | GPS, Glonass, Beidou, Galileo | GPS, GLONASS, Galileo, BeiDou, QZSS |
| Battery and Charging | ||
| The figure the maker states | up to 60 hours | up to 96 hours |
| What that figure measures | With always-on display on | In normal use |
| Capacity | 590 mAh | 320 mAh |
| Charging Type | No data | Magnetic charging |
| Water and Dust Resistance | ||
| Water Resistance | 10 ATM | 5 ATM |
| IP Rating | IP68 | No data |
| MIL-STD-810 | MIL-STD-810H | No data |
| Performance | ||
| RAM | 2 GB | No data |
| Storage | 64 GB | No data |
| Connectivity | ||
| Cellular | Optional | No data |
| Wi-Fi | Wi-Fi 4 | No data |
| Bluetooth | 5.3 | 5.4 |
| NFC | Yes | Yes |
| Speaker | No data | Yes |
| Microphone | No data | Yes |
| Software | ||
| Operating System | Wear OS | Xiaomi HyperOS 3 |
| Phone Compatibility | No data | Android and iOS |
Xiaomi Watch S4 41mm leads on 3 of 5 compared specs.
This table is based on manufacturers official specifications. Winning on paper does not always mean a difference in everyday use.