Amazfit T-Rex Ultra 2 Review: Monster Battery Life Meets Premium Outdoor Ambition

The Amazfit T-Rex Ultra 2 enters the premium smartwatch market as a rugged, outdoor-focused alternative to the established Ultra-tier models from Apple, Samsung, and Huawei. Its headline feature is an extraordinary battery life that dwarfs most competitors, but the full picture includes both impressive strengths and notable omissions. In independent testing, it earned a rating of 1.4 (Very Good), placing 5th out of 50 smartwatches tested.

Everyday Endurance

The T-Rex Ultra 2 houses an 870mAh battery — significantly larger than most competing smartwatches — and it delivers on that capacity impressively. In everyday use without GPS, the watch lasts a full 8.5 days on a single charge. That is not quite the record — the Huawei Watch GT 6 Pro manages 9 days in the same scenario — but the real differentiator is GPS-active training endurance.

GPS Training Endurance

With continuous GPS tracking enabled, the Amazfit T-Rex Ultra 2 delivers over 55 hours of training time. That is an extraordinary figure. For context, the Huawei model manages 32 hours in the same test before running flat. For ultra-runners, multi-day hikers, and adventure sportspeople who need their watch to keep tracking across extended expeditions, this is a genuinely transformative level of endurance.

Charging Speed

Charging is reasonably quick: 50% capacity is reached in roughly half an hour, with a full charge taking approximately 1 hour and 50 minutes. Qi wireless (inductive) charging is not supported.

Construction and Materials

The T-Rex Ultra 2 is built for punishment. The case combines plastic and titanium, and the watch is water-resistant to 10 ATM — rated for diving to 45 metres. A functioning dive computer is integrated, making this one of the very few smartwatches that can genuinely accompany divers below the surface. The watch also operates in temperatures as low as -30°C.

Size and Weight Considerations

However, this durability comes at a cost: the watch is very large. At 54.7 x 57 x 17.5mm, it dwarfs even the already-substantial Samsung Galaxy Watch Ultra, which measures 47mm across with a 16mm thickness. At 92g, the T-Rex Ultra 2 is among the heaviest smartwatches available. For users with smaller wrists, or those who want a watch that transitions seamlessly from trail to office, the size is likely prohibitive.

Despite the enormous case, the OLED display measures a standard 1.50 inches at 480 x 480 pixels (326 ppi). The screen does not take advantage of the extra real estate — it sits within a particularly thick bezel and housing. The display itself is very bright, with a manufacturer-claimed peak of 3,000 cd/m², and is protected by scratch-resistant sapphire glass. An always-on display mode is available.

The control scheme is one of the T-Rex Ultra 2's most praised aspects. Four physical buttons allow full operation without touching the screen — a significant advantage during sports activities, in wet conditions, or when wearing gloves. There is no rotating crown, but voice control is available.

Customisation options are extensive. Font size on the display can be adjusted, and alarm, notification, and voice assistant volumes can each be set independently. The strap uses a quick-release mechanism for easy swapping. The included band is plastic.

One minor criticism: the watch responds somewhat slowly to wrist-raise gestures to activate the display. Performance within the menus themselves, however, is described as smooth and responsive.

Sports Modes and Training

The sports tracking capabilities are extensive. The T-Rex Ultra 2 supports a large selection of sports modes, with multi-sport functionality allowing free combination of activities. It includes support for the Hyrox competition format, which combines running with functional fitness exercises. Training plans and analysis tools are comprehensive, and offline maps with on-watch route planning make it a strong companion for outdoor navigation.

The integrated dive computer provides depth warnings and time tracking — a genuine feature rather than a marketing checkbox. The watch is fully suitable for swimming (10 ATM) and diving to 45 metres.

Health Monitoring

Health monitoring covers heart rate (optical), blood oxygen saturation (SpO2), heart rate variability, sleep tracking, and body temperature recording. ### Missing Health Features

However, two notable features are absent: there is no ECG function and no automatic fall detection with emergency calling. For a watch at this price tier, competing directly with Apple Watch Ultra and Samsung Galaxy Watch Ultra, these omissions are conspicuous. Buyers who consider these health safety features essential should look elsewhere.

Operating System and Apps

The T-Rex Ultra 2 runs ZeppOS 5, Amazfit's proprietary operating system. The app selection is described as good, with few meaningful limitations compared to Android Wear or watchOS. The watch pairs with both Android smartphones and iPhones via the Zepp app, delivering notifications and allowing Bluetooth call forwarding. A microphone and speaker are built in for on-wrist calls.

Storage and Payments

Internal storage is generous at 64GB, supporting offline music and map data. NFC is included for contactless payments, though Zepp Pay requires routing through the Curve banking app rather than working natively with standard payment providers.

A dual-colour torch (white/green) is built into the case — a practical addition for outdoor use in poor visibility.

No Cellular Connectivity

The most significant smart feature limitation is the complete absence of cellular connectivity. There is no SIM slot, no eSIM, and no mobile data capability. The watch is entirely dependent on a Bluetooth-paired smartphone for internet access, notifications (beyond cached ones), and the AI assistant. For a watch positioned as an ultra-grade outdoor companion, the inability to operate independently is a notable gap — particularly for safety-conscious users who might want to call for help without their phone nearby.

The battery life measurement methodology uses a worst-case scenario: the display is set to 60% brightness with always-on enabled, and the watch is automatically activated every minute. This produces a conservative figure that reflects heavy real-world use. Charging time, display quality, sensor accuracy, and build quality are all assessed under controlled laboratory conditions, with results verified by the editorial team.

The Amazfit T-Rex Ultra 2 retails from approximately €550. The price assessment in testing was rated 4.6 (Very Expensive) — reflecting that while the watch offers strong features, it is not meaningfully cheaper than the Apple Watch Ultra 3, Samsung Galaxy Watch Ultra, or Huawei Watch GT 6 Pro. At this price tier, the missing ECG, fall detection, and cellular connectivity become harder to justify.

The Amazfit T-Rex Ultra 2 sits alongside the Apple Watch Ultra 3 (rated 1.3, Very Good), the Google Pixel Watch 2 LTE (rated 1.6, Good), and the Google Pixel Watch 4 LTE (rated 1.5, Good) in the premium smartwatch rankings. The Apple Watch Ultra 3 leads overall with its complete feature set including ECG, fall detection, and cellular connectivity, but cannot match the Amazfit's battery endurance. The Huawei Watch GT 6 Pro comes closest on battery life at 9 days everyday use but falls short during GPS-tracked activities. For pure outdoor endurance, the T-Rex Ultra 2 remains unmatched.

The Amazfit T-Rex Ultra 2 is a compelling premium outdoor smartwatch with genuinely exceptional battery life — particularly for GPS-tracked activities, where nothing in the current market comes close to its 55-hour endurance. The integrated dive computer, rugged titanium-and-plastic construction, excellent physical controls, and comprehensive sports tracking make it a strong proposition for outdoor enthusiasts.

However, at €550, it sits in direct competition with the Apple Watch Ultra 3, Samsung Galaxy Watch Ultra, and Huawei Watch GT 6 Pro — all of which offer features the Amazfit lacks, including ECG monitoring, fall detection, and cellular connectivity. The enormous size will also limit its appeal. For buyers who prioritise battery endurance and outdoor durability above all else, the T-Rex Ultra 2 delivers impressively. Those who need a more complete health and connectivity feature set may find the established alternatives better suited to their needs.