Amazfit T-Rex 3 Pro vs Amazfit T-Rex Ultra 2
The Amazfit T-Rex Ultra 2 lists for about $150 more than the Amazfit T-Rex 3 Pro. On the headline smartwatch-mode figure, 30 days for the Amazfit T-Rex Ultra 2 against 17 days for the Amazfit T-Rex 3 Pro. Amazfit publishes no always-on figure for the Amazfit T-Rex 3 Pro. For a GPS workout the figures are 50 h and 26 h. Every other published figure for both is in the table, with the rows where they differ tinted.
Amazfit
Amazfit T-Rex 3 Pro
Android; iPhone with limitsPaid tier: Zepp Aura
~$400
Two case sizes set the T-Rex 3 Pro apart from the single-size T-Rex 3: a 44 mm model rated at 17 days and a 48 mm one rated at 25.
Best for: Hikers and divers who want a rugged mapping watch, including a 44 mm size for smaller wrists.
Amazfit
Amazfit T-Rex Ultra 2
Android; iPhone with limitsPaid tier: Zepp Aura
~$550
Amazfit's expedition model uses a 51 mm titanium-trimmed case, an 870 mAh battery and 64GB of storage.
Best for: Multi-day backpackers, divers and cold-weather users who want the longest-running T-Rex without solar.
| Specification | Amazfit T-Rex 3 Pro | Amazfit T-Rex Ultra 2 |
|---|---|---|
| Approx. price | ~$400 (44 mm, regular price $399.99 on us.amazfit.com (both sizes list at $399.99; on sale from $312.99 on 2026-10-06)) | ~$550 (Black Magma, $549.99 on us.amazfit.com) |
| Type | Rugged outdoor | Rugged outdoor |
| Platform | Zepp OS | Zepp OS |
| Case sizes | 44 mm / 48 mm | 51 mm |
| Weight | 44 mm: 46.8 g · 48 mm: 52 g (without strap) | 51 mm: 89.2 g (with strap) |
| Battery, smartwatch mode | 17 days (Amazfit: "Typical Use Battery Life: 48mm: Up to 25 days 44mm: Up to 17 days" (44 mm figure used)) | 30 days (Amazfit: "Typical Use Battery Life: Up to 30 days" (heavy use up to 15 days)) |
| Battery, always-on display | Not published by the maker | 10 days (Amazfit: "AOD Mode: Up to 10 days") |
| Always-on keeps | not published | 33% of the headline figure |
| Battery, GPS workout | 26 h (Amazfit: "Accurate GPS Mode: 48mm: Up to 38 hours 44mm: Up to 26 hours" (dual-frequency, all satellites; 44 mm figure used); no standard single-band figure published) | 50 h (Amazfit: "Accurate GPS Mode: Up to 50 hours" (dual-frequency, all satellites); no standard single-band figure published) |
| Battery, dual-band GPS | 26 h | 50 h |
| Battery note | 44 mm / 48 mm: Power-Saving GPS (single frequency) 51 / 74 hours, GPS Max Battery Life 86 / 116 hours (hiking and climbing modes only); no always-on battery figure published. | Amazfit: Power-Saving GPS (single frequency) up to 90 hours, GPS Max Battery Life 177 hours, Low Temperature Mode up to 40 hours with GPS. |
| Works with | Android; iPhone with limits | Android; iPhone with limits |
| iPhone | Yes, with limits | Yes, with limits |
| Android | Yes | Yes |
| Phone limits | Amazfit says typed message replies are Android only and lists Call Quick Reply as Android only; phone camera control is iOS only. | Amazfit lists Call Quick Reply as Android only, so iPhone owners cannot send quick replies from the watch; phone camera control is iOS only. |
| Paid tier | Zepp Aura, $69.99/year | Zepp Aura, $69.99/year |
| What the paid tier gates | No watch feature requires it; Amazfit sells workout and recovery data in the Zepp App with no subscription. Zepp Aura adds unlimited AI sleep-assistant chats (free users get one message a day), detailed weekly and monthly sleep reports, and the full sleep and meditation music library. | No watch feature requires it; Amazfit sells workout and recovery data in the Zepp App with no subscription. Zepp Aura adds unlimited AI sleep-assistant chats (free users get one message a day), detailed weekly and monthly sleep reports, and the full sleep and meditation music library. |
| Update years | Not published by the maker | Not published by the maker |
| Cleared health features | None the maker cites | None the maker cites |
| Display | AMOLED | AMOLED |
| Always-on display | not published | Yes |
| Dual-band GPS | Yes | Yes |
| Maps | Full topo maps on the watch (Amazfit: "Preloaded Base Maps, Contour, Ski Resort, Turn-by-Turn, POI Search, Route Planning, Round-Trip, Auto Rerouting") | Full topo maps on the watch (Amazfit: "Preloaded Base Maps, Downloadable Contour Maps & Ski Resort Maps, Turn-by-Turn Navigation, POI Search, Route Planning, Auto Rerouting"; 64GB storage) |
| Music on the watch | Yes | Yes |
| LTE | No LTE version | No LTE version |
| Contactless pay | No | No |
| Flashlight | Yes | Yes |
| Water rating | 10 ATM | 10 ATM |
| Case | fiber-reinforced polymer case, grade 5 titanium bezel and buttons | fiber-reinforced polymer case, grade 5 titanium bezel, buttons and back |
| Released | 2025 | 2026 |
Amazfit T-Rex 3 Pro: what it gives up
- The 44 mm model gives up eight days of typical use against the 48 mm
- Amazfit publishes no always-on battery figure
- Typed message replies and call quick replies are Android only
Amazfit T-Rex Ultra 2: what it gives up
- 89.2 g with strap is heavy for sleep tracking
- 51 mm case only; no smaller size
- Contour maps must be downloaded; only base maps are preloaded
Full pages: Amazfit T-Rex 3 Pro · Amazfit T-Rex Ultra 2