Amazfit T-Rex Dual Solar vs Samsung Galaxy Watch Ultra 2
The T-Rex Dual Solar focuses on outdoor endurance, with offline maps, dual-band GPS and dual-sided solar charging that can substantially extend battery life. The Galaxy Watch Ultra 2 is much more of a full smartwatch, with LTE, ECG, apps and deeper phone integration, but it needs charging far more often.
Full comparison
The full record
77 specifications across 6 areas, with 36 genuine differences.
1. Design & display Samsung Galaxy Watch Ultra 2
Fact
Amazfit T-Rex Dual Solar
Samsung Galaxy Watch Ultra 2
Release date
2026-09-22
2026-07
Physical size
51.4 mm diameter; 16.9 mm thick including heart-rate sensor; 14.5 mm excluding sensor
47.4 x 47.1 x 10.7 mm
Weight
69 g without strap
61.5 g
Material
Grade 5 titanium bezel and buttons; fiber-reinforced polymer middle frame; Grade 5 titanium and glass-ceramic back
Titanium case; sapphire crystal
Water resistance
10 ATM; recreational diving to 50 m
10 ATM; IP69K; MIL-STD-810H; EN13319
Color options
Basalt Black
Titanium Gray, Titanium Silver
Display type
AMOLED
Super AMOLED, full-colour Always On Display
Display size
1.32 inch
1.5 inch (38.5 mm)
Display resolution
466 x 466 pixels (353 ppi)
498 x 498 pixels
Display brightness
Up to 3,000 nits
Up to 5,000 nits
Display protection
Sapphire glass
Sapphire crystal
2. Battery & charging Amazfit T-Rex Dual Solar
Fact
Amazfit T-Rex Dual Solar
Samsung Galaxy Watch Ultra 2
Battery
Rechargeable battery; 660 mAh
Rechargeable battery; 800 mAh
Battery life
Up to 25 days typical; 13 days heavy use; up to 34 days with front solar / 51 days with rear solar (3 h/day at 50,000 lux); up to 41 hours accurate GPS; Outdoor Extreme up to 40 days / 180 days with continuous rear solar at 50,000 lux
Up to 80 hours with AOD off; up to 60 hours with AOD on
Charging
Magnetic charging head; dual-sided solar charging
Fast wireless charging
3. Sensors & positioning Samsung Galaxy Watch Ultra 2
Fact
Amazfit T-Rex Dual Solar
Samsung Galaxy Watch Ultra 2
GNSS type
Built-in dual-band GNSS
Built-in dual-band GNSS
GPS
Yes
Yes
GALILEO
Yes
Yes
GLONASS
Yes
Yes
QZSS
Yes
Yes
Beidou
Yes
Yes
Accelerometer
Yes
Yes
Gyroscope
Yes
Yes
Barometric altimeter
Yes
Yes
Compass
Yes
Yes
Geomagnetic
Yes
Yes
Ambient light sensor
Yes
Yes
Optical heart rate
Yes
Yes
Electrical heart rate
No
Yes
SpO2
Yes
Yes
Temperature
Yes
Yes
Galvanic skin response
No
Yes
Microphone
Yes
Yes
Speakers
Yes
Yes
Vibration motor
Yes
Yes
4. Health & activity Samsung Galaxy Watch Ultra 2
Fact
Amazfit T-Rex Dual Solar
Samsung Galaxy Watch Ultra 2
Steps
Yes
Yes
Distance
Yes
Yes
Calories burned
Yes
Yes
Floors
Yes
Yes
Sports tracking
180+ sports modes
Yes
Sleep
Yes
Yes
Heart rate
Yes
Yes
HRV
Yes
Yes
Stress
Yes
Yes
Blood oxygen
Yes
Yes
Respiration rate
No
Yes
Skin temperature
Yes
Yes
ECG
No
Yes
Blood pressure
No
Yes (Samsung Health Monitor; availability varies by market, calibration required)
Body composition
No
Yes
Glucose
No
No
Hydration level
No
No
UV exposure
No
No
Calorie intake
No
No
Hyperglycemia risk assessment
No
No
Arterial stiffness detection
No
No
Pulse wave arrhythmia analysis
No
Yes
5. Smart features Samsung Galaxy Watch Ultra 2
Fact
Amazfit T-Rex Dual Solar
Samsung Galaxy Watch Ultra 2
Smartphone compatibility
Android 8.0+ and iOS 17.0+
Android with Google Mobile Services
Operating system at launch
Zepp OS 6
Wear OS 7 Powered by Samsung; One UI 9 Watch
Storage
26 GB available for maps, music, apps and data
64 GB
Bluetooth
Yes (5.2)
Yes (6.0)
Wi-Fi
Yes (2.4 GHz)
Yes (802.11 a/b/g/n, 2.4/5 GHz)
NFC / connected pay
Yes (Zepp Pay, region-dependent)
Yes
UWB
No
No
Cellular
No
Yes (LTE/eSIM)
Smartphone notifications
Yes
Yes
Bluetooth calling
Yes
Yes
Smartphone music control
Yes
Yes
On-board music storage
Yes
Yes
Voice assistant
Zepp Flow
Google Gemini / Bixby
6. Navigation & safety Mixed
Fact
Amazfit T-Rex Dual Solar
Samsung Galaxy Watch Ultra 2
Maps
Yes (base, contour and ski-resort maps)
Yes (Google Maps)
Offline maps
Yes
Yes (Google Maps)
Navigation
Yes (turn-by-turn, POI display, route planning and waypoint navigation)
Yes (turn-by-turn navigation)
Emergency SOS
No
Yes
Satellite SOS
No
No
Fall detection
No
Yes
LED flashlight
Yes
No
Diving
Yes (recreational diving to 50 m)
Yes (EN13319; depth and dive metrics to 40 m)