The Amazfit T-Rex Dual Solar adds front- and rear-side solar charging, sapphire glass and a Grade 5 titanium bezel, while the T-Rex 3 costs less and has a larger display with a slightly higher stated typical-use battery estimate. Solar can extend the Dual Solar’s runtime in strong light, but Amazfit says it does not replace USB charging.
How do the T-Rex Dual Solar and T-Rex 3 compare?
| Feature | Amazfit T-Rex Dual Solar | Amazfit T-Rex 3 |
|---|---|---|
| Solar charging | Front- and rear-side solar capture; Amazfit lists solar-assisted battery estimates under specified light exposure. Amazfit product specifications | No solar charging listed in Amazfit’s T-Rex family comparison. |
| Typical-use battery estimate | Up to 25 days without the listed solar uplift. Amazfit product specifications | Up to 27 days. Amazfit product specifications |
| Display | 1.32-inch AMOLED, up to 3,000 nits peak brightness, sapphire glass. Amazfit product specifications | 1.5-inch AMOLED, up to 2,000 nits peak brightness, Gorilla Glass. Amazfit product specifications |
| Bezel and buttons | Grade 5 titanium. Amazfit product specifications | Stainless-steel bezel. Amazfit product specifications |
| Shared outdoor features | Dual-band GPS, offline maps, 10 ATM water resistance; 180+ workout modes. Amazfit family comparison | Dual-band GPS, offline maps, 10 ATM water resistance; 170+ workout modes. Amazfit family comparison |
| US store price | $649.99 on the Amazfit US store listing accessed October 12, 2026. Check current listing | $279.99 on the Amazfit US store listing accessed October 12, 2026. Check current listing |
The specifications and battery figures above are Amazfit’s published claims, not results from an independent side-by-side test. Store prices are volatile and may change.
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What does dual-sided solar charging do?
Amazfit says the Dual Solar can collect solar energy through either its AMOLED display or its glass-ceramic back plate. The company describes the watch as “the world’s first AMOLED smartwatch featuring a dual-sided solar charging system” in its September 22, 2026 announcement; that is Amazfit’s claim, not an independently verified market-wide finding. Amazfit announcement
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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesThe useful distinction is that sunlight is an endurance boost, not a substitute for charging by cable. Amazfit says solar charging helps slow power consumption but cannot replace standard USB cable charging. The T-Rex 3 has no solar charging listed in the manufacturer’s family comparison.
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How do the battery-life estimates differ?
Dual Solar: solar scenarios depend on strong, sustained light
Amazfit lists up to 25 days of typical use for the Dual Solar. Its additional estimates are up to 34 days with three hours of front-side solar exposure or up to 51 days with three hours of rear-side exposure, with the solar scenarios specified at 50,000 lux. These are manufacturer estimates, not guaranteed runtimes or independent test results. The 34- and 51-day figures should not be read as what every owner should expect from ordinary daylight.
Amazfit notes that actual battery life varies with settings and operating conditions. Its typical-use scenario includes limited screen-on time and sleep monitoring; its heavy-use scenario includes Bluetooth calls or music, GPS exercise and other use. Solar charging is subject to temperature restrictions and is disabled when the battery is nearly full. Dual Solar battery and charging details
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T-Rex 3: a slightly higher typical-use estimate without solar
Amazfit lists up to 27 days of typical use and up to 13 days of heavy use for the T-Rex 3. The typical-use estimate is two days higher than the Dual Solar’s non-solar figure, but these are manufacturer estimates with model-specific usage conditions—not results from a matched test. Amazfit also lists up to 42 hours in accurate GPS mode; that figure should not be compared directly with battery claims for a different GPS mode or test setup. T-Rex 3 specifications
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Which screen and materials suit you better?
The Dual Solar’s 1.32-inch display is smaller than the T-Rex 3’s 1.5-inch screen, but its stated peak brightness is higher: up to 3,000 nits versus up to 2,000 nits. The Dual Solar also specifies sapphire glass, while the T-Rex 3 specifies Gorilla Glass. Those published differences may matter if you prefer a more compact display or prioritize the listed cover material; the larger T-Rex 3 screen gives more display area. Peak-brightness figures alone do not establish how the watches compare in every real-world lighting condition.
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For the exterior, Amazfit lists a Grade 5 titanium bezel and buttons on the Dual Solar and a stainless-steel bezel on the T-Rex 3. The Dual Solar is therefore the more premium-materials option on the specifications cited here, alongside its higher listed US price.
What outdoor features do they share?
Amazfit’s family comparison lists both watches with dual-band GPS, offline maps and 10 ATM water resistance. The same comparison lists 180+ workout modes for the Dual Solar and 170+ for the T-Rex 3. These shared navigation and rugged-use features mean the choice is less about whether either watch has the basic outdoor capabilities and more about solar, display size, materials and cost. Amazfit T-Rex family comparison
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Which Amazfit watch should you choose?
Choose the Dual Solar if solar exposure and materials matter most
- You can regularly expose the watch to strong sunlight during long outings and value the possibility of extending the interval between cable charges.
- You prefer sapphire glass, a Grade 5 titanium bezel and buttons, or the higher stated peak-brightness figure.
- You are comfortable paying the higher price shown on Amazfit’s US store listing as of October 12, 2026.
Choose the T-Rex 3 if you want a larger screen at a lower listed price
- You would rather have a 1.5-inch display than solar charging.
- The listed up-to-27-day typical-use estimate suits you, and you do not need solar-assisted battery estimates.
- You want the lower of the two checked US store prices while retaining the shared dual-band GPS, offline maps and 10 ATM rating.
This is a feature-based choice drawn from Amazfit’s published specifications; the available information does not establish which watch lasts longer in a controlled, independent comparison.
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