A leak from the Zepp app: New Amazfit T-Rex Dual Solar watches gather energy from both the display and the back side

Solar charging in watches has been Garmin’s territory for years, and most competitors handle it more as a marketing bonus. Amazfit clearly wants to take it seriously — traces of the Amazfit T-Rex Dual Solar model appeared in the Zepp app, and especially of a mode that goes further than what anyone else offers today.

The Zepp app revealed the name and the model

The Gadgets & Wearables website dug through the source files of the Zepp app in version 10.7.3 and found the full watch name in them. Until now, the upcoming model was only referred to by an internal code, but now it’s listed directly as Amazfit T-Rex Dual Solar with code A2570.

Besides the name, very specific components also showed up: SolarStatsActivity, SolarIntensityServiceImpl, SolarIntensityDataHandler, and SolarBatteryChargeRemotePlugin. Their naming makes it clear that the watches won’t just quietly collect solar energy — they’ll track statistics about it and show them to you. They’ll measure radiation intensity in kLux.

Solar Boost Mode: watches that give up features in exchange for power

The most interesting thing in the entire find is the Solar Boost Mode. When you turn it on, the watches will limit the display to an absolute minimum — they’ll show only the time, battery status, and the current sunlight intensity. Most other features, including syncing with your phone and transferring recorded routes, will be disabled in the meantime.

The goal is clear: push power consumption so low that the solar panel can realistically cover it and the battery will recharge during the day instead of draining. It’s a different philosophy than at Garmin, where solar cells mainly extend battery life and the watches still work normally. Amazfit goes harder — and honestly, you’ll lose a big part of what made you buy a smartwatch in the first place. It makes sense for multi-day trips, not in a typical week.

Two solar panels and open questions

The “Dual” tag in the name probably isn’t accidental. The code shows fields watch_face_input_power and case_back_input_power, meaning two separate power inputs — one around the watch face and the other on the back side of the case. However, the find’s authors themselves point out that you can’t make a firm conclusion from variable names, so for now it should be seen as a very likely, not confirmed, thing. The watches should also indicate when charging efficiency drops — for example, when your sleeve covers the panel.

The focus is clearly based on findings: hiking, expeditions, and long periods without access to a charger. Amazfit hasn’t revealed the exact specifications, design, presentation date, or price yet, and the app leak doesn’t mention them either—Notebookcheck also has the find. Since the watches are already integrated into the app’s latest version, though, the launch shouldn’t be far off.

Certifications indicate that the launch is close

Besides the app leak, we also have harder evidence. Watches with the model designation A2570 have passed US FCC certification—the applicant is Anhui Huami, i.e., the parent company behind the Zepp Health brand. In addition to it, they were approved by regulators in Malaysia, Indonesia, South Korea, and the Eurasian Economic Union. So many certifications at once usually means the launch is weeks away, not months.

From the public documentation, you can also glean something about the construction. The case is expected to be about 50 millimeters in diameter (the internal metal frame measures 49.97 × 51.67 mm). The body is built on reinforced metal chassis, and the watches have four buttons—two on each side—i.e., the classic T-Rex layout. Wi‑Fi and Bluetooth in the 2.4 GHz band are also confirmed.

But you won’t be able to see photos of the watch yet. In its filing, Amazfit requested confidential attachments, so both the external and internal images remain unavailable until 8 February 2027. Interestingly, some websites read the diagrams as if the second solar cell is a ring around the display—not a panel on the back of the case—but the Zepp app code seems to point more toward the back side. Amazfit hasn’t confirmed when the watches will debut in full; some media speculate they’ll be shown at IFA from 4 to 8 September.

To get more updates from the world of Xiaomi, keep following our Xiaomi Planet website. Join our Facebook group, where we build an active community and help each other out. Subscribe to our Telegram as well, where we add the best deals and coupons from China every day.