# Amazfit T-Rex Dual Solar Review: DC Rainmaker Finds Negligible Solar Gains on AMOLED Rugged Watch

Canonical page: https://savlume.com/items/l4yeryszjcejrnyirfgzrqyk9
Publisher: Savlume
Published on Savlume: 2026-09-22T11:00:00.000Z
Content updated: 2026-10-11T19:06:37.749Z
Source publication time: 2026-09-22T11:00:00.000Z
Offer status: Unverified

DC Rainmaker tested the $649 Amazfit T-Rex Dual Solar, an outdoor smartwatch that pairs a 1.3-inch AMOLED screen with front and rear solar panels. The reviewer praised its informative on-watch solar metrics widget and novel industrial design, but concluded that actual solar energy gains are virtually negligible relative to AMOLED power consumption. Significant trade-offs include a reduced 660mAh battery compared to the T-Rex Ultra 2 and rapid overheating during rear-panel solar charging in warm weather, making it an interesting tech showcase rather than a practical endurance tool.

## Media review

The source describes the T-Rex Dual Solar as an ambitious AMOLED-and-solar combination with a useful solar-data interface, but concludes that its real-world solar gains are small and that the design comes with trade-offs including a smaller battery, smaller display, and higher price than the T-Rex Ultra 2.

Attribution: DC Rainmaker
AI-assisted summary of source text, not a Savlume hands-on test.

- Source-reported strength: The Solar widget separates front- and rear-panel gains and presents estimated gains across three watch modes.
- Source-reported strength: The reviewer found the solar-gain information more detailed and practical than the Garmin watch solar displays they discussed.
- Source-reported strength: The watch can reportedly charge from 0% using solar alone.
- Source-reported limitation: The reviewer found solar gains small in real-world use, with battery consumption often offsetting the gains.
- Source-reported limitation: The rear panel overheated during testing in warm conditions, interrupting solar gains.
- Source-reported limitation: Compared with the T-Rex Ultra 2, the Dual Solar has a smaller battery and display and is reported to cost $100 more.

### How much battery gain did the reviewer report from a day outdoors?

The reviewer said days spent outside typically produced about 2.5–3.0 days of smartwatch-mode solar gains, while also noting that solar gains could be offset by battery use.

### Does the rear solar panel work while the watch is worn?

The source describes the rear panel as facing the wrist when worn and says it is intended to be turned toward the sun when the watch is off the wrist.

### What are the listed differences from the T-Rex Ultra 2?

The source lists a 660mAh rather than 870mAh battery, a 1.3-inch rather than 1.5-inch AMOLED display, a 50m rather than 45m depth-gauge allowance, a different flashlight color, LiveShare, and a reported $649 versus $549 price.
## Evidence and sources

Source report only. Merchant price, availability, seller, and conditions have not been independently confirmed.
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DC Rainmaker: https://www.dcrainmaker.com/2026/09/amazfit-t-rex-dual-solar-complete-solar-deep-dive.html

Purchase destination: https://www.amazon.com/Amazfit-T-Rex-Solar-AMOLED-Offline/dp/B0HJSPH4L7?SubscriptionId=AKIAIIWZVTXZYIZVROWA

AI-assisted summary of cited source material. Not a hands-on review. Prices and availability can change.