Between the T-Rex 3 and Watch Series 11 (45mm), the T-Rex 3 comes out ahead in battery life and water resistance, while the Watch Series 11 (45mm) wins on peak brightness and weight. Overall, the T-Rex 3 scores 79.7 and the Watch Series 11 (45mm) scores 60.5 on our Mars Score.
Which should you buy?
The T-Rex 3 is the clear pick on raw spec strength, leading by 19.2 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the T-Rex 3 if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. The biggest gaps in its favor are battery life, water resistance.
Pick the Watch Series 11 (45mm) if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. Its strongest claims are peak brightness, weight, display size, among others.
Both ship with comparable spo2, so those specs don't separate the two — focus on the differences below.
Bottom line: the T-Rex 3 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Amazfit - T-Rex 3 wins
- ▲Battery life — 1766.67% more. 672 h vs 36 h.
- ▲Water resistance — 5.00 ATM more. 10 vs 5.
Why Apple - Watch Series 11 (45mm) wins
- ▲Peak brightness — 50.00% more. 3000 nits vs 2000 nits.
- ▲Weight — 30.00 g less. 38 vs 68.
- ▲Display size — 28.00% more. 1.92 " vs 1.5 ".
- ▲Has ECG.
- ▲Has Cellular.
Spec comparison
Design
| Spec | Amazfit - T-Rex 3 | Apple - Watch Series 11 (45mm) |
|---|---|---|
| Case size | 48.5 mmlead | 45 mm |
| Weight | 68 g | 38 glead |
| Case material | polymer | aluminum |
| Water resistanceⓘ | 10 ATMlead | 5 ATM |
Display
| Spec | Amazfit - T-Rex 3 | Apple - Watch Series 11 (45mm) |
|---|---|---|
| Display size | 1.5 " | 1.92 "lead |
| Always-on display | true | true |
| Peak brightnessⓘ | 2000 nits | 3000 nitslead |
Health & Fitness
| Spec | Amazfit - T-Rex 3 | Apple - Watch Series 11 (45mm) |
|---|---|---|
| ECG | false | truelead |
| SpO2 | true | true |
| Temperature sensor | true | true |
| Sleep tracking | true | true |
| Blood pressure | false | false |
Battery & Connectivity
| Spec | Amazfit - T-Rex 3 | Apple - Watch Series 11 (45mm) |
|---|---|---|
| Battery life | 672 hlead | 36 h |
| GPS | true | true |
| Cellular | false | truelead |
| NFC | false | truelead |
| OS | Zepp OSlead | watchOS |
Frequently asked
Which has longer battery life, T-Rex 3 or Watch Series 11 (45mm)?+
T-Rex 3 lasts 672h vs 36h.
Do T-Rex 3 or Watch Series 11 (45mm) support ECG?+
Watch Series 11 (45mm) supports ECG; T-Rex 3 does not.
Which has cellular, T-Rex 3 or Watch Series 11 (45mm)?+
Watch Series 11 (45mm) offers a cellular variant; T-Rex 3 is Wi-Fi only.
Spec-level deep dives
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