Battery life Amazfit T-Rex 2 vs T-Rex 3: which really lasts longer?

On paper: two monsters

On the technical sheet side, Amazfit T-Rex 2 claims up to 24 days of typical use, approximately 26 hours of continuous GPS, and up to 45 days in economy mode. This is already huge for a watch with an AMOLED screen.

There T-Rex 3 goes even further: around 27 days of typical use, 13 days of intensive use, more than 40 hours in precise GPS mode, and much more in eco GPS modes. In summary, on paper, in this Amazfit T-Rex 2 vs Amazfit T-Rex 3 duel, the 3 takes a slight advantage.

In real life, on your wrist

The theory is good, but what matters is the load you see on the screen.

In real mixed use (notifications, sleep monitoring, 2–3 GPS sessions per week, limited Always-On):

• Amazfit T-Rex 2 often holds 8 to 12 days without stressing. You sometimes forget when you've charged it, which is the best compliment you can give a watch.
• Amazfit T-Rex 3 rather rises to 10–14 days under the same conditions. If you are reasonable about the Always-On and the cards, you easily get the two weeks.

Obviously, if you spend your time in high precision GPS + maps, you will drop these figures on the T-Rex 3. The screen and navigation are consuming. But you have the choice: eco GPS modes, reduced brightness, deactivation of certain sensors.

Basically, autonomy should not be the main reason to avoid the T-Rex 3. In this Amazfit T-Rex 2 vs Amazfit T-Rex 3 comparison, both are largely “in the green” on the battery side. The 2 remains monstrous, the 3 keeps the margin despite its more ambitious screen.

How I tested the Amazfit T-Rex 2 and T-Rex 3

A little method point, because EEAT is not just a fashionable word:

• Wear on the wrist over several weeks, never less than 7 days in a row for each model.
• Typical use: notifications activated, sleep monitoring, 3 sports sessions/week (running, hiking, a little cycling).
• GPS tests on the same routes, same conditions, to compare the tracks.
• Test in town, forest, hilly paths to see behavior in “complicated” conditions.

The impressions, figures and feelings of this comparison Amazfit T-Rex 2 vs Amazfit T-Rex 3 come from this area, not just marketing sheets. If Amazfit pushes a big update that really changes behavior, I'll put a release note above the article.

Sport, GPS and outdoor: Amazfit T-Rex 2 vs T-Rex 3 on the ground

Dual band GPS: very good vs very serious

The two watches play in the court of Multi-satellite dual-band GPS. The T-Rex 2 already works with dual bands and several systems, which is more than enough for trail running, hiking, light mountain biking. The tracks are clean, the distances consistent, you don't have the impression of running into walls.

With the Amazfit T-Rex 3Amazfit pushes a more recent generation: modernized dual-band GPS, 6 satellite systems, better management in difficult areas (forests, narrow streets). The tracks are more stable, the turns are better taken, the drifts are less frequent.

We're not going to pretend: if you're obsessed with meter precision for pure performance, you'll end up with a dedicated cardio belt and a very competition-oriented ecosystem anyway. But for 95% of runners and hikers, the GPS of the T-Rex 2 is already very good, that of the T-Rex 3 is... very reassuring.

Maps, navigation, altimeter: the T-Rex 3 advantage

On the T-Rex 2you already have:

• Importing routes via the Zepp app,
• Return to starting point, compass, altimeter-barometer,
• More than 150 sports profiles.

For many people, this is enough to cover hiking, trail running and basic mountain outings.

There Amazfit T-Rex 3 adds a game-changing layer:

• Offline maps and navigation directly on the wrist,
• 170+ sports, including finer modes for trail, skiing, water sports, etc.,
• Altimeter-barometer still there, with a more readable display thanks to the large screen.

If you are very into altitude difference, orientation and committed hiking, it is worth checking out this comparison Amazfit T-Rex 2 vs T-Rex 3 with our advanced comparison of the best watches with altimeter. This allows us to situate T-Rexes in relation to real references of the genre.

Health sensors and “smart” functions

On the health side, both do the job: heart rate, SpO₂, sleep monitoring, stress, PAI, VO₂max, training load analysis. The base is the same, with finer differences in the software processing on the T-Rex 3 side.

On the “smart” functions, however, things are getting worse:

• T-Rex 2 : no microphone, no NFC, no on-board music. This is a solid outdoor watch, not an “urban” smartwatch.
• T-Rex 3 : integrated microphone, NFC depending on region, music storage and control, further integration with Zepp Flow for voice. It's clearly more versatile on a daily basis.

If you want to stay in the Amazfit universe but with a more urban style, you can take a look at our complete test of the Amazfit GTR 3 Pro watch. This puts the positioning of T-Rexes versus more “urban” models into perspective.

Zepp app, price and shopping experience

Zepp app: complete, sometimes verbose, but effective

Both watches run under Zepp OSwith synchronization in the Zepp app. You recover:

• Your cardio curves and intensity zones,
• Your sleep and your deep/light phases,
• Maps of your routes,
• Training stats, load, recovery.

No compulsory subscription to use the essentials. The interface is clear, but sometimes busy: you have pages of data that the majority will never read. This remains a good basis for this Amazfit T-Rex 2 vs Amazfit T-Rex 3 comparison, both benefiting from the same ecosystem.

Prices, promotions, value/price ratio

At launch, Amazfit T-Rex 2 was around €229–249. Today, you often find it much lower, especially during promotional periods. This is where the watch becomes really indecent in terms of quality/price ratio.

There T-Rex 3it is more likely to be around €249–299 depending on the time and the stores. Given the combo of XXL screen, maps, modernized dual-band GPS, NFC, microphone and additional sports, it remains very competitive with the market.

If you find that the T-Rex format is too massive for your daily life, keep in the back of your mind the detailed test option of the lightweight Amazfit Bip 6 watch. Same Zepp ecosystem, but more discreet format and even lower price.

Where to buy the Amazfit T-Rex 2 at the right price?

If after this Amazfit T-Rex 2 vs Amazfit T-Rex 3 comparison you clearly recognize yourself as “T-Rex 2 profile”, the most logical thing is to take advantage of the promotions:

See the price of the Amazfit T-Rex 2 on Amazon

Where to buy the Amazfit T-Rex 3?

If the screen, offline maps and smart functions make the difference for you, the T-Rex 3 is the natural candidate:

See the price of the Amazfit T-Rex 3 on Amazon

Both links are there to save you time. You compare, you see the real difference in price, and you decide based on your use, not just the technical sheet.

Which profile for which Amazfit T-Rex? My verdict on the ground

Profile 1 – Occasional hiker/trail/weekend backpacker

You do day hikes, short trails, a bit of bivouac, you want to see your elevation, your cardio, your sleep, but you don't spend your life zooming in on a map on your wrist.

• Amazfit T-Rex 2 : largely sufficient. Dual band GPS, altimeter-barometer, enormous autonomy, tank case. You trace your outings, you import routes, you return to the starting point. And you keep budget for shoes or bag.
• Amazfit T-Rex 3 : useful if you really want maps and detailed navigation. But it is no longer essential for this profile.

Profile 2 – Regular cardio/muscle/fitness athlete

You train several times a week: running, weight training, cycling, some competitions. You want clean stats, sleep tracking, a watch that doesn't annoy you.

• T-Rex 2 : excellent entry point. 150+ sports, battery life that doesn't give up, GPS more than enough for the majority of sessions.
• T-Rex 3 : more sports, more readable screen indoors and outdoors, bonus smart functions. If you can afford the price difference, the experience is smoother on a daily basis.

Profile 3 – Geek of stats, maps, big releases

You love stats, you do a lot of trail running, serious hiking, you travel and you want everything on your wrist: maps, clean tracks, autonomy on big outings.

• T-Rex 2 : honestly, a little limiting if you live on navigation and detailed maps.
• Amazfit T-Rex 3 : it's her. Offline maps, more robust GPS, 170+ sports, micro, NFC. We remain below the big monsters like Fenix ​​on certain points, but at the asking price, it is very strong.

If you want to explore other “indestructible” options in the same spirit, you can compare with our selection of ultra-robust unbreakable connected watches. It helps to see if you stay Amazfit… or if you go for something else.

Final Recap: Amazfit T-Rex 2 vs Amazfit T-Rex 3

• Tight budget, need a real outdoor watch : Amazfit T-Rex 2. Unbeatable value for money if you grab it on sale.
• Want a “dashboard” wrist with maps and big screen : Amazfit T-Rex 3. There, the difference is seen every day.
• Very basic use (little sport, no cards) : staying on T-Rex 2 or going down to Bip 6 is more logical.
• Already in T-Rex 2 : if you won't use cards or NFC, just changing “for the new thing” is still a bad idea.

Basically, if you just want an outdoor watch that can handle everything, the Amazfit T-Rex 2 remains the best smart deal. If you want your wrist as a dashboard with maps, large screen, more daily functions, the Amazfit T-Rex 3 tick the boxes. And there, you understand why she is so attractive.

By David Deteve – editor & field tester. Impressions of this comparison Amazfit T-Rex 2 vs Amazfit T-Rex 3 come from real releases, not from a product sheet.