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Wearable comparison

AmazFit T-Rex Ultra vs Amazfit Balance 2

Compare battery life, health tracking, display and fit.

Compared products
01Selected
AmazFit T-Rex Ultra

AmazFit T-Rex Ultra

  • Screen: 454 × 454 pixels, 326 ppi.
  • Runs Zepp OS 3.5.
  • 500 mAh battery capacity.
  • 2.3 GB storage.
  • Bluetooth 5.0.
KSh 47,000Out of Stock
02
Amazfit Balance 2

Amazfit Balance 2

  • Screen: 480 × 480 pixels; 323 ppi.
  • 32 GB storage in this version.
  • Runs Zepp OS 6.
  • 658 mAh battery capacity.
  • Bluetooth 5.2.
KSh 39,000In Stock
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WHOOP Peak 5.0 SensorKSh 38,000
Amazfit T-Rex 3 ProKSh 55,000
Amazfit Balance 3KSh 48,000
Google Pixel Watch 4KSh 44,500
Samsung Galaxy Watch Ultra 2025KSh 44,000
Samsung Galaxy Watch UltraKSh 45,000
Apple Watch Series 10KSh 47,000
2 of 4 products

Our quick verdict

The Amazfit Balance 2 lasts longer in outdoor workouts (33 vs 28 hours), is lighter to wear all day and has a brighter screen for outdoor use, while the AmazFit T-Rex Ultra has a sturdier stainless steel build.

Display

AmazFit T-Rex Ultra
454 × 454 pixels, 326 ppi
Amazfit Balance 2
480 × 480 pixels; 323 ppi

Software

AmazFit T-Rex Ultra
Runs Zepp OS 3.5
Amazfit Balance 2
Runs Zepp OS 6

Capacity

AmazFit T-Rex Ultra
500 mAh battery capacity
Amazfit Balance 2
658 mAh battery capacity

Portability

AmazFit T-Rex Ultra
89 g
Amazfit Balance 2
43 g

Storage

AmazFit T-Rex Ultra
2.3 GB storage
Amazfit Balance 2
32 GB storage

Key differences

The main differences to help you choose.

AmazFit T-Rex Ultra

  • Stainless steel case (vs plastic case).
  • Charging: Magnetic charging base.

Amazfit Balance 2

  • Longer sport-mode battery: up to 33 hours in GPS mode (vs 28 hours in GPS: mode).
  • Bigger battery: 658 mAh (vs 500 mAh).
  • Brighter display: up to 2,000 nits (vs 1,000).
  • Lighter: 43 g (vs 89 g).
  • More storage: 32 GB (vs 2.3 GB).
  • Two speakers.

What matters most to you?

Choose any priorities

How each product answers the questions buyers ask most. Tick a topic to add it, untick one to hide it.

6 priorities selected.
How each product answers the selected priorities
PriorityAmazFit T-Rex UltraAmazfit Balance 2
Battery life500 mAh battery658 mAh battery
Portability89 g43 g
Storage2.3 GB storage32 GB storage
Display1.39-inch OLED display, 326 ppi1.5-inch OLED display, 323 ppi
SoftwareZepp OS 3.5Zepp OS 6
ConnectionsBluetooth 5.0Bluetooth 5.2

Detailed comparison

Explore the full specifications, section by section.

Display

Display specifications comparison
SpecificationAmazFit T-Rex UltraAmazfit Balance 2
Display1.39-inch AMOLED1.5-inch AMOLED
Screen resolution454 × 454 pixels, 326 ppi480 × 480 pixels; 323 ppi
Display protectionGlassSapphire glass
Display featuresUp to 1,000 nits; Always-On Display; 120+ watch faces—

Connectivity

Connectivity specifications comparison
SpecificationAmazFit T-Rex UltraAmazfit Balance 2
Wi-Fi2.4 GHz Wi-FiWi-Fi 2.4 GHz
BluetoothBluetooth 5.0 BLEBluetooth 5.2 BLE
Positioning / GNSSBuilt-in dual-band L1/L5 positioning; six satellite systemsDual-band GNSS; circularly polarized antenna; 6 satellite systems
Satellite features—No

Identity & design

Identity & design specifications comparison
SpecificationAmazFit T-Rex UltraAmazfit Balance 2
BrandAmazfitAmazfit
ModelAmazfit T-Rex UltraAmazfit Balance 2
Dimensions47.3 × 47.3 × 13.45 mm, excluding heart-rate sensor base47.4 × 47.4 × 12.3 mm without heart-rate sensor base
Weight89 g without strap43 g without strap
Build materials316L stainless-steel bezel, back panel, bridge and buttons; polymer-alloy middle frameAluminum-alloy frame; fibre-reinforced polymer case
Wrist size140–205 mm140–210 mm
Strap / band22 mm silicone strap with classic pin buckle22 mm silicone; pin buckle; standard and accessory straps
Controls / buttonsFour physical buttons; glass touchscreenTwo physical buttons and touchscreen
Announced—June 24, 2025

Performance & software

Performance & software specifications comparison
SpecificationAmazFit T-Rex UltraAmazfit Balance 2
StorageUp to 2.3 GB available for music32GB
Operating systemZepp OS 3.5Zepp OS 6

Audio & communication

Audio & communication specifications comparison
SpecificationAmazFit T-Rex UltraAmazfit Balance 2
SpeakerNo built-in speaker; audio through connected Bluetooth headphonesTwo speakers
Microphone—Supported
Calling—Bluetooth calling

Sensors, health & fitness

Sensors, health & fitness specifications comparison
SpecificationAmazFit T-Rex UltraAmazfit Balance 2
SensorsBioTracker PPG biometric sensor with SpO₂; accelerometer; gyroscope; geomagnetic sensor; barometric altimeter; ambient-light sensorBioTracker 6.0 PPG; 5 PD + 2 LED; accelerometer; gyroscope; barometer; ambient light; geomagnetic sensor; temperature
Health & wellness features24-hour heart-rate, blood-oxygen and stress monitoring; one-tap measurement; PAI; breathing exercises; health alerts24-hour heart rate, SpO₂ and stress; one-tap measurement; high and low heart-rate alerts; low SpO₂ alerts; breathing exercises; PAI; heart-rate recovery; menstrual-cycle tracking; HybridCharge
Sleep trackingSleep stages including REM; naps; sleep schedule; breathing quality; sleep scoreSleep HRV; sleep stages including REM; naps; sleep schedule; breathing quality; sleep score
Sports / workout modes162 sports modes; smart recognition of 25 strength movements and 8 sports movements; freediving workouts180+ sports modes
Training & outdoor featuresOffline maps and route navigation; Zepp Coach; PeakBeats; Track Run; trajectory correction; Virtual Pacer; training templates and intervals; external heart-rate belt and cycling power meter; altitude, sun, moon and tide toolsZepp Coach; PeakBeats; HybridCharge; training and interval templates; HYROX templates and Virtual Pace; track running; trajectory correction; virtual pacer; offline maps; golf and ski maps
Safety & emergency featuresStorm warnings; altitude blood-oxygen reminders; abnormal heart-rate, low-SpO₂ and high-stress alerts—
Diving / depth featuresOutdoor and indoor freediving and spearfishing; depth and water-temperature data; rated to 30 m; EN13319 and ISO 6425 diving certificationsScuba-diving support; follow the manufacturer’s dive-mode limits and safety guidance

Battery & durability

Battery & durability specifications comparison
SpecificationAmazFit T-Rex UltraAmazfit Balance 2
Battery capacity500 mAh rated658 mAh rated
Battery lifeTypical: up to 20 days; saver: 25 days; clock: 50 days; heavy: 9 days; accuracy GPS: 28 h; automatic GPS: 46 h; power-saving GPS: 58 h; endurance GPS: 80 h; low-temperature GPS: 10 h21 days typical; 10 days heavy; 33 hours accurate GPS; 67 hours GPS power saver
ChargingMagnetic charging base; approximately 2 hoursMagnetic charging head
Water resistance10 ATM; ISO 22810:201010 ATM
Durability / certificationsMud-resistant design; ultra-low-temperature mode down to −30 °C; SGS-certified 10 ATM testing; EN13319 and ISO 6425 diving certificationsMIL-STD-810G-2014 low-pressure, temperature, shock, vibration and impact tests; TUV water-resistance report 68.189.25.0132.01

Compatibility

Compatibility specifications comparison
SpecificationAmazFit T-Rex UltraAmazfit Balance 2
Phone compatibilityAndroid 7.0 or later; iOS 12.0 or laterAndroid 7 or later; iOS 15 or later
Companion appZepp AppZepp
ColorsAbyss Black; SaharaBlack; Lava accessory strap

Additional specifications

Additional specifications specifications comparison
SpecificationAmazFit T-Rex UltraAmazfit Balance 2
Case material—Aluminum alloy; fibre-reinforced polymer
Pixels per inch—323 ppi
Peak brightness—2,000 nits peak
Packing list—Watch with standard strap; magnetic charging head; instruction manual
Smart recognition—25 strength-training movements; 8 sports movements
Third-party fitness apps—Runna; Strava; TrainingPeaks; Intervals.icu; Google Fit; Apple Health

Similarities

  • Both are water resistant to 100 m.
  • Both have OLED displays.
  • Both have similar screen sizes (1.39 and 1.5 inches).
  • Both connect over Bluetooth.
  • Both use 2.4 GHz Wi-Fi only.

In summary

For most buyers the Amazfit Balance 2 is the better buy; the AmazFit T-Rex Ultra makes sense if you want a sturdier stainless steel build.

Back to compared products ↑

In-stock alternatives

Apple Watch Series 10For AmazFit T-Rex UltraApple Watch Series 10View product ↗Amazfit Balance 3For AmazFit T-Rex UltraAmazfit Balance 3View product ↗OnePlus Watch 4For Amazfit Balance 2OnePlus Watch 4View product ↗

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