- Battery life
- Display
- Weight
- Water resistance
Specs that matter
- Panel
- AMOLED
Product highlights
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Where to buy
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Should you buy it?
Skip the T-Rex Dual Solar at Amazfit's $649.99 (Oct 7, 2026) and buy the $549.99 T-Rex Ultra 2, because DC Rainmaker found the solar panels add almost nothing: leaving the watch out in the sun all day gained just 2% to 3% of battery. To fit panels on the front and back, Amazfit shrank the battery to 660mAh from the Ultra 2's 870mAh and the AMOLED to 1.32 inches from 1.5, so you pay $100 more for a smaller screen and less rated GPS time (40 hours versus 50). DC Rainmaker's rear panel overheated and stopped charging within about 10 minutes at 80 to 90 degrees Fahrenheit, one sunny two-hour ride logged no solar gain at all, and the new side charger doesn't fit Amazfit's other watches. Buy it only if you camp for days in cool, sunny places and want its titanium bezel, 10 ATM dive rating and unusually detailed solar widget, and know that ZDNET (3.0 out of 5) found the 51.4mm, 69 g case comes in one big size.