The Amazfit T-Rex Dual Solar takes a very different approach to solving one of the biggest smartwatch problems: battery life. Instead of putting a solar charging surface only around the display, Amazfit has added solar charging to both the front and back of the watch.
Amazfit calls this the world’s first dual-sided solar charging system for an AMOLED smartwatch. The rugged outdoor watch is listed at $649.99 and combines solar charging with sapphire glass, Grade 5 titanium, offline maps and advanced training features.
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What Is Dual-Sided Solar Charging?
Most solar smartwatches collect energy from the front surface. The T-Rex Dual Solar can capture solar energy through the AMOLED display as well as a glass-ceramic back plate.
The rear charging area is more than twice the active charging area of the front system. This means the watch can continue collecting energy when placed face-down or attached to a backpack with the rear exposed to sunlight.
This is particularly interesting for hikers, trekkers and travellers who may spend several days away from a charging point.
Amazfit T-Rex Dual Solar Battery Life
Inside is a 660mAh battery, with Amazfit claiming up to 25 days of typical battery life without relying on additional solar charging.
Solar exposure can extend that figure significantly.
| Usage Mode | Claimed Battery Life |
|---|---|
| Typical use | Up to 25 days |
| Typical use + 3 hours front solar | Up to 34 days |
| Typical use + 3 hours rear solar | Up to 51 days |
| Accuracy GPS mode | Up to 41 hours |
The comparison information provided by Amazfit shows that dual-sided solar charging is exclusive to the new model among the T-Rex watches listed alongside it.
That 51-day figure is particularly important because it demonstrates why the solar panel on the back exists. It provides considerably more charging area when properly exposed to sunlight.
1.32-Inch AMOLED Display With 3,000 Nits Brightness
The Amazfit T-Rex Dual Solar gets a 1.32-inch AMOLED display protected by sapphire glass.
Peak brightness reaches 3,000 nits, which is designed to keep maps, workout information and navigation instructions visible outdoors under strong sunlight.
Interestingly, Amazfit manages to combine this bright AMOLED panel with solar charging through the front display.
That is important because many outdoor solar watches traditionally use different display technologies to maximise power efficiency.
Built for Extreme Outdoor Conditions
The watch uses a combination of Grade 5 titanium, a fibre-reinforced polymer frame and a glass-ceramic shell.
Amazfit says the watch has military-grade durability and can keep essential functions working at temperatures as low as -30 degrees Celsius.
The case measures 51.4mm, making this a fairly large outdoor watch.
It measures 16.9mm thick including the heart-rate sensor and uses a 26mm quick-release strap.
10 ATM Water Resistance and Diving Support
The T-Rex Dual Solar comes with 10 ATM water resistance and supports recreational scuba diving.
Amazfit specifies 50-metre freediving support for this model. Automatic dive detection can start tracking when the user enters the water and record information such as time and depth.
This makes the watch much more than a conventional fitness smartwatch aimed only at running and gym workouts.
Offline Maps and Route Planning
Navigation is another major part of the Amazfit T-Rex Dual Solar experience.
The watch includes preloaded base maps, while contour maps and ski resort maps can be downloaded.
There is also turn-by-turn navigation, POI search, route planning and automatic rerouting.
Users can create point-to-point routes directly from the watch and store up to 100 routes, which can be useful when travelling somewhere without reliable mobile connectivity.
LiveShare Location Tracking
A particularly useful outdoor feature is LiveShare Location Tracking.
It lets users share their real-time location, direction and selected activity information with family members, friends or teammates while on an outdoor activity.
The feature requires a compatible smartphone, an active internet connection and regional support. Amazfit also clearly states that LiveShare is not a replacement for a dedicated emergency communication or rescue device.
More Than 180 Sports Modes
The watch supports 180+ sports modes, covering activities such as hiking, recreational diving, golf and HYROX training.
Amazfit has also added what it calls Advanced Hybrid Training.
Users can follow structured training plans while monitoring metrics including training load, Training Effect, VO2 Max and recovery time.
HybridCharge Explained
Do not confuse HybridCharge with the solar charging system.
HybridCharge is Amazfit’s energy and recovery intelligence feature. It combines information including Training Load, BioCharge and LifeLoad to provide a broader picture of exercise, recovery, sleep and everyday physical demands.
Training plans can also be imported from TrainingPeaks, Runna and Intervals.icu, while completed activities can automatically sync with Strava.
Built-In Flashlight, Calls and Zepp Flow
A rugged watch becomes much more useful outdoors when it can replace a few small accessories.
The T-Rex Dual Solar includes a built-in flashlight with white and red light modes. Boost Mode provides additional brightness while an SOS flashing function can help attract attention.
It also includes a microphone and speaker.
Users can take Bluetooth calls, hear navigation or training prompts and use Zepp Flow for hands-free Android message replies.
Amazfit T-Rex Dual Solar vs T-Rex Ultra 2 vs T-Rex 3 Pro
| Feature | T-Rex Dual Solar | T-Rex Ultra 2 | T-Rex 3 Pro 48mm | T-Rex 3 Pro 44mm |
|---|---|---|---|---|
| Display | 1.32-inch AMOLED | 1.5-inch AMOLED | 1.5-inch AMOLED | 1.32-inch AMOLED |
| Brightness | 3,000 nits | 3,000 nits | 3,000 nits | 3,000 nits |
| Sapphire Glass | Yes | Yes | Yes | Yes |
| Battery | 660mAh | 870mAh | 700mAh | 500mAh |
| Typical Battery | Up to 25 days | Up to 30 days | Up to 25 days | Up to 17 days |
| Solar Charging | Dual-sided | No | No | No |
| GPS Accuracy Mode | Up to 41 hours | Up to 50 hours | Up to 38 hours | Up to 26 hours |
| Water Resistance | 10 ATM | 10 ATM | 10 ATM | 10 ATM |
| Sports Modes | 180+ | 180+ | 180+ | 180+ |
The interesting part is that the T-Rex Dual Solar does not have the biggest battery in the range.
The T-Rex Ultra 2 has an 870mAh battery, but solar assistance gives the new model a completely different advantage when sunlight is available.
Amazfit T-Rex Dual Solar Price
The Amazfit T-Rex Dual Solar price is $649.99 on the product information supplied by Amazfit.
The package includes the smartwatch, a silicone strap and a USB Type-C compatible charging base. Amazfit does not include an additional cable in the box.
You can also check Amazfit T-Rex smartwatches on Amazon.
Why the Amazfit T-Rex Dual Solar Is Interesting
This not just another solar smartwatch. It is the way Amazfit has combined AMOLED, front solar charging and rear solar charging in one rugged outdoor watch.
There is still a normal charging base for times when solar exposure is limited, but the idea is to make charging less frequent during long outdoor trips.
Add sapphire glass, Grade 5 titanium, offline maps, 10 ATM water resistance, diving support, a flashlight and up to 51 days with rear solar assistance, and the T-Rex Dual Solar becomes one of Amazfit’s most ambitious outdoor watches yet.