Last Updated: June 24, 2026 — Zepp Health app version 10.5.0 teardown published June 22 reveals active solar charging infrastructure. This is the most detailed breakdown of what was found and what it means for Amazfit fans.
If you have been following Amazfit for a while, you already know how this works. A new Zepp Health app drops. Someone tears it apart. Hidden strings confirm what is coming next — weeks or months before Zepp Health says a word officially.
It happened with the Active 3 Premium. It happened with the T-Rex Ultra 2. And now, in version 10.5.0 of the Zepp Health app released this week, researchers found something that could define Amazfit’s next chapter entirely.
Solar charging code. Detailed, active, sync-facing solar charging code.
Here is the full breakdown — every string, what it does, and what it tells us about the watch Zepp Health is quietly building.
What Was Found in Zepp Health App 10.5.0
The discovery comes from a teardown published by Gadgets & Wearables on June 22, 2026. Three specific code strings tell the story.
String 1: solar_intensity
This is a real-time sensor reading — how much sunlight is currently hitting the watch face. This is not a passive diagnostic. It is a display-facing data field, meaning Zepp Health plans to surface this number directly to users, either on the watch itself or inside the app dashboard.
If you have used a Garmin Fenix Solar, you already know this feature. Garmin shows a solar intensity graph tracking sunlight exposure over the previous hours. Amazfit appears to be building the exact same thing.
String 2: watch_face_input_power
The amount of power being harvested through the watch face display. This confirms the primary solar collection method — a photovoltaic layer integrated into or beneath the watch face, collecting energy as the display faces upward.
This is identical in concept to Garmin’s Power Glass technology, which embeds a transparent solar layer between the display and the outer lens.
String 3: case_back_input_power
This is the most interesting string — and the one that sets this apart from anything Garmin currently does.
A separate power input tracked from the back of the case. This could mean a secondary solar panel on the case back itself, an additional charging path through a specialized dock, or a novel energy harvesting approach that no current production smartwatch uses.
If the case back collects solar energy independently of the watch face, the watch could harvest light in two orientations simultaneously — face up on a desk and face down on a wrist both contribute. That would be a genuinely new approach to solar wearables.
The Older Code Context
This is not the first solar reference in Zepp’s codebase. Earlier app builds already contained a SolarBatteryChargeRecord object with fields including lux, panelType, status, and chargePowerPercent. Those were passive, backend strings.
What changed in 10.5.0 is that these new strings are active and sync-facing — the kind of code you write when you are preparing a feature for real users to see, not internal engineers testing prototypes.
The progression from passive diagnostic strings to active user-facing strings is significant. This is moving from “we are experimenting” to “we are preparing to ship.”
What Display Type Makes Sense
This is the most important technical question — and the answer shapes everything about what this watch will actually be.
Solar charging extends battery life meaningfully only when the display itself is power-efficient. On an AMOLED display, solar harvesting adds days at best.
On a MIP transflective display — the technology used in the Garmin Fenix Solar and Instinct Solar — solar can multiply battery life several times over.
Amazfit actually knows this technology well. The Amazfit Bip S launched back in 2020 with a transflective MIP display and achieved 40 days of battery life with zero solar input. That hardware foundation still exists inside Zepp Health’s engineering team.
A solar watch built on MIP display technology at Amazfit’s current sensor and GPS capability level could realistically target 60 to 100+ days of battery in mixed conditions. That number would directly challenge the Garmin Instinct Solar’s headline specs — at a fraction of the price.
Garmin has been moving away from MIP and solar, betting on AMOLED and premium displays. That creates an opening. Amazfit appears to be walking through it.
Which Amazfit Model Gets Solar First
No model name appears in the leaked code. But two candidates stand out based on current development signals.
Amazfit T-Rex Ultra 2
The T-Rex Ultra 2 launched in February 2026 at $549 — titanium bezel, 870mAh battery rated at 30 days, full-color offline maps, dual-band GPS, 10 ATM water resistance. It is already Amazfit’s best outdoor watch. Solar charging added to this hardware would push battery from 30 days to potentially 60-80+ days in mixed conditions — a number that directly challenges the Garmin Fenix 8 Solar at $849 while costing $300 less.
The question is not whether the T-Rex Ultra 2 exists — it does and it is excellent. The real question is what comes next.
The Amazfit T-Rex 4 is already being speculated for late 2026 — and this solar leak changes that conversation entirely. If Zepp Health is preparing solar hardware right now, the T-Rex 4 becomes the most logical first carrier.
It would launch with solar built in from day one rather than as a mid-cycle refresh — giving Amazfit a clean “T-Rex 4 Solar” story to tell against Garmin’s Instinct Solar at the exact same price point.
Think about the positioning: T-Rex 4 with 30-day base battery + solar extension pushing 60-80+ days, dual-band GPS, rugged build, offline maps — at an expected $249 to $269.
Against a Garmin Instinct Solar at $349 with older GPS hardware and no AMOLED. That is not a budget alternative. That is a direct win on specs and price simultaneously.
For everything confirmed so far on the T-Rex line — where Ultra 2 sits today and what T-Rex 4 is expected to bring — our Amazfit T-Rex 4 release date and specs guide has the full breakdown.
Amazfit Falcon 2
The Falcon 2 has appeared in Zepp app code with the pairing identifier support_bind_falcon-2025. The original Amazfit Falcon was the brand’s highest-end outdoor watch — titanium unibody, sapphire glass, 20 ATM water resistance.
A Falcon 2 with solar would position Amazfit as a genuine premium alternative to Garmin’s solar lineup rather than just a budget option.
A New Product Line
A third possibility worth considering: Zepp Health launches an entirely new product category around solar — similar to how Garmin separated the Instinct Solar as a distinct product rather than a feature on existing models.
A “Amazfit Apex Solar” or similar name targeting the mid-range outdoor market would give the brand a clean product story without disrupting the existing T-Rex and Falcon lines.
Zepp OS Angle — What Solar Means for the Software
This is the part most coverage misses — and as a Zepp OS user, you already know how deeply the app integrates with hardware data.
The solar_intensity string is a real-time sync field. That means the Zepp Health app will display solar data alongside your existing health metrics — HRV, Body Vitality Index, training load, sleep score.
Imagine your morning dashboard showing not just your recovery status but also yesterday’s solar harvesting performance and a projected battery extension based on today’s weather forecast.
Zepp OS 4 already has solid widget customization. A solar intensity widget — showing live lux readings and accumulated solar gain — would be a natural addition to the watch face ecosystem that Amazfit’s community already uses heavily.
The chargePowerPercent field from earlier code also suggests the app will show users what percentage of their daily battery needs are being offset by solar.
That kind of transparency would be new for the category — Garmin shows solar intensity graphs but does not give you a clean “solar covered X% of your day” number.
Amazfit Solar vs Garmin Solar — The Real Comparison
Garmin currently dominates solar with the Fenix 8 Solar and Instinct Solar. Here is an honest comparison of where things stand.
| Garmin Instinct Solar | Garmin Fenix 8 Solar | Amazfit Solar (Expected) | |
|---|---|---|---|
| Display | MIP transflective | MIP transflective | MIP likely |
| Solar placement | Watch face | Watch face | Watch face + case back possible |
| Battery (power save, solar) | Up to 54 days | Up to 107 days | Unknown |
| Multi-band GPS | No | Yes | Likely yes |
| Price | $349 | $849 | $350-$550 estimated |
| Subscription | No | No | No expected |
| Ecosystem | Garmin Connect | Garmin Connect | Zepp Health / Zepp OS |
| Third-party apps | Limited | Limited | Growing — Zepp OS app store |
The price column is where Amazfit wins every time. If the solar performance is even 70% of what Garmin achieves, the value proposition at half the price is compelling for the majority of outdoor users who are not professional athletes.
The ecosystem column is where Zepp Health still trails. Garmin Connect’s training analysis depth, particularly for running and cycling, remains ahead of Zepp Health for serious athletes. But for general outdoor use — hiking, trekking, camping — the gap has narrowed significantly with Zepp OS 4.
The Amazfit Balance 2 review shows exactly how close Amazfit has come to Garmin-level tracking in real-world tests — solar battery extension on a similarly capable outdoor watch would be the final piece.
Should You Wait for the Amazfit Solar Watch
Should You Wait for the Amazfit Solar Watch
Honest answer — depends on your situation.
Wait if you are currently considering a Garmin Instinct Solar or Fenix Solar and the price is the main barrier. An Amazfit solar watch at $350 to $500 with comparable battery extension would change that calculation entirely. There is no confirmed timeline, but Zepp Health’s code progression suggests this is closer to launch than it is to early experimentation.
Do not wait if you need a new outdoor watch in the next 30 to 60 days. The Amazfit T-Rex 3 Pro vs Balance 2 comparison shows the two best options available right now — solar extension would be a meaningful upgrade but the current lineup is genuinely good for most outdoor users.
Already own a Helio Strap? A solar-powered outdoor watch could replace your two-device setup entirely. Our Amazfit Helio Strap review explains the current recovery tracking experience and what always-on solar battery would change for 24/7 wear.
Not sure which Amazfit is right for you right now? Our complete Amazfit buying guide ranks every current model — it is the fastest way to decide whether to buy now or wait for solar.
Frequently Asked Questions
Is Amazfit releasing a solar smartwatch?
No official announcement yet. Researchers found detailed solar charging code in Zepp Health app version 10.5.0 on June 22, 2026. The code is active and sync-facing — more advanced than earlier passive references — but no product name or launch date has been confirmed.
What does “case_back_input_power” mean?
It is a code string tracking power input from the back of the watch case — separate from the watch face solar collection. It could indicate a secondary solar panel on the case back, a novel energy harvesting path, or charging diagnostics. It is the most unique element of this leak and suggests Amazfit may be taking a different technical approach than Garmin’s face-only solar system.
Will this use Zepp OS?
Almost certainly yes. All current Amazfit outdoor watches run Zepp OS. The solar data strings are sync-facing fields that will appear in the Zepp Health app alongside existing health and fitness data.
Which model will get solar first — T-Rex or Falcon?
The T-Rex 4 is the strongest candidate right now. The T-Rex Ultra 2 already launched in February 2026 — adding solar mid-cycle is unlikely. But the T-Rex 4 is being speculated for late 2026, and the timing of this solar leak aligns perfectly with that launch window. If Zepp Health is building solar hardware right now, launching it inside the T-Rex 4 as a headline feature makes far more commercial sense than a quiet mid-cycle update. The Falcon 2 is also possible but targets a higher price point. Our best guess: T-Rex 4 is Amazfit’s first solar watch.
How does this compare to Garmin’s solar technology?
Garmin uses Power Glass — a photovoltaic layer inside the display. Amazfit’s code suggests both watch face and case back collection. Direct performance comparison is impossible until official specs are released. Price is likely to be Amazfit’s primary advantage.
When will it launch?
No confirmed date. App code typically precedes hardware launch by months. Late 2026 or early 2027 is plausible based on the current development stage.
Related Reading on SmartWatchSphere
- Amazfit T-Rex 3 vs T-Rex 3 Pro — Which Should You Buy?
- Best Amazfit Smartwatch in 2026 — Find Yours in 60 Seconds
- Amazfit Active 2 Review 2026:I’ve Worn It for 16 Months —My Honest Take
Sources; – Gadgets & Wearables, Notebookcheck, and ChineseSmartwatches.com
Written by Sunil Bhatt — SmartWatchSphere, your dedicated source for Amazfit and Zepp OS coverage. All specs are based on app code analysis as of June 24, 2026. Updated immediately when Zepp Health makes an official announcement.
Last updated: June 24, 2026
