Apple Watch Ultra 4: same new health system, up to 50 hours of battery

On September 9, 2026, alongside the iPhone 18 Pro and the iPhone Duo, Apple also announced the new Apple Watch Ultra 4. The device shares the new Health Sensing System with the Apple Watch Series 12, but stands apart mainly on battery life, its rugged case, and outdoor sports features. Below are all the confirmed specifications, plus how Apple is positioning this watch in the market and what has, and hasn’t, changed compared with the Ultra 3.

How Apple positions the Watch Ultra 4

Kaiann Drance, Apple’s VP of Worldwide Product Marketing for Apple Watch, described the device at the announcement as follows: “The new Health Sensing System and S11 chip take Apple Watch Ultra 4 to the next level.” Apple calls the Ultra 4 the “ultimate sports and adventure watch” and, based on its own analysis of best-selling wearables as of August 2026, claims it’s “the most comprehensive wearable across health, fitness, and safety.” Positioning is therefore unchanged from earlier Ultra generations: a rugged watch for extreme athletes, divers, and adventurers that still covers every everyday Apple Watch feature.

Health: new sensors and the Readiness Score

As with the Series 12, the biggest change is in the sensors: a completely redesigned heart sensor array with more powerful LEDs and larger electrodes now measures heart rate every five seconds, sixty times more often than the Ultra 3 according to Apple. Heart rate variability (HRV) is measured 24 times more frequently than before. Apple calls the result “the most accurate heart rate sensor in a wearable” on the market.

New is the daily Readiness Score: a 0-to-10 rating with a concrete recommendation (Recover, Pace Yourself, Ready, or Go For It), based on activity, vitals, and sleep. Overnight Vitals now adds recovery HRV analysis, and Daytime Vitals is a new separate view for daytime metrics. The Health app itself gains two new tabs, Insights with a daily health summary and Longevity for long-term trends, plus movement evaluations (flexibility, strength, balance) and a new Health Age feature that shows how someone’s health metrics compare with their actual age. In the United States, a partnership with Quest Diagnostics also lets users add an extended lab test covering more than fifty biomarkers for $119.

Audio Intelligence and the S11 chip

Under the hood is the new S11 chip, with a 64-bit dual-core processor and a 4-core Neural Engine (with components derived from the A20 Pro found in the iPhone 18 Pro), plus 64GB of storage. That extra processing power is needed for Audio Intelligence, arriving later this year: sound recognition that alerts for things like sirens, alarms, doorbells, or a crying baby, a Live Rewind feature that plays back the last 15 seconds of spoken audio as text after a double-click of the Digital Crown, automatic Siri-generated conversation summaries, and Shazam integration in the Smart Stack. Apple stresses that no audio is recorded or stored: processing happens in a dedicated secure hardware compartment (Secure Exclave), and transcripts are end-to-end encrypted, with every feature opt-in. Audio Intelligence does require at least an iPhone 16 (excluding the 16e).

Battery: finally a noticeable jump

Battery life is the clearest difference from the Series 12 and the biggest improvement over the Ultra 3: up to 50 hours of normal use (up from 42 hours), up to 84 hours in Low Power Mode, and up to 45 hours during a long outdoor workout in the new Max Extended Workout mode. Charging is also faster: 15 minutes on the charger adds 18 hours of extra battery.

Display and case: deliberately unchanged

Anyone expecting a redesign will be disappointed: the Ultra 4 keeps the same 49mm-tall, 44mm-wide, 12mm-thick titanium case as the Ultra 3, with the same Always-On Retina display (wide-angle OLED, LTPO3, refreshing down to 1Hz, 422 by 514 pixels, 326 ppi) with 3,000 nits of peak brightness and flat sapphire crystal. Weight is 63.0 grams (Natural) or 63.1 grams (Black). For comparison, Samsung’s Galaxy Watch Ultra 2 reaches 5,000 nits of peak brightness, well above the Apple Watch Ultra 4.

Diving, swimming, and navigation

The Ultra 4 is water resistant to 100 meters under ISO 22810:2010 and certified under EN13319 for recreational diving to 40 meters, with a depth gauge accurate to within 1 meter. For navigation, it uses dual-frequency GPS (GPS, Galileo, QZSS, and BeiDou). What’s missing, and what rivals like the Garmin Fenix 9 do offer, are offline topographic maps, a real gap for anyone heading into genuinely remote terrain without cell coverage.

Connectivity: satellite, 5G, and Wi-Fi

For emergencies outside Wi-Fi or cellular range, Emergency SOS, Messages, and Find My all work via satellite. The cellular version supports 5G NR and LTE with international roaming, alongside Bluetooth 5.3 and a second-generation Ultra Wideband chip. Notably, the Ultra 4 still tops out at Wi-Fi 4 (802.11n), while this year’s iPhone 18 Pro moves on to Wi-Fi 7.

Materials and sustainability

The case is made from 100 percent recycled titanium (Grade 5), in Natural and Black finishes. Apple also cites 45 percent recycled content overall, 100 percent recycled cobalt in the battery, manufacturing powered by renewable energy, and packaging that is 100 percent fiber-based.

Colors, bands, and pricing

Alongside the usual Natural and Black titanium finishes, there’s a new Apple Watch Hermès Ultra 4, with a natural titanium case and a Grand H titanium band; as of this writing, Apple hasn’t published a final price for it. New band colors include the Trail Loop (dark umber, sand, burgundy), the Alpine Loop (desert, dark olive, burgundy), and the Ocean Band (translucent gray, translucent kelp, translucent black).

The Apple Watch Ultra 4 starts at $799, exactly what the Ultra 3 cost last year, despite all the new features. Buyers who prefer to spread the cost can choose Apple’s own Apple Upgrade program (in partnership with Klarna) at $24.99 per month over 24 months. Pre-orders opened September 9, 2026, with devices in stores since September 18.

Apple Watch Ultra 4 versus the Garmin Fenix 9

For anyone serious about outdoor sports, Garmin remains the main rival. The Garmin Fenix 9 wins decisively on battery life: 10 to 29 days of normal use, compared with just over two days for the Ultra 4, and up to 291 days in power-saving mode on the Pro Solar version. Garmin is also stronger on navigation, with offline topographic maps and multi-band GNSS with SatIQ, both of which the Ultra 4 lacks. On the other hand, the Fenix 9 costs considerably more at $999.99 to $1,199 versus the Ultra 4’s $799. In short: for multi-day expeditions, ultramarathons, or use without an iPhone, Garmin remains the obvious choice; for anyone already invested in Apple’s ecosystem doing workouts under 18 hours, the Ultra 4’s deeper iPhone integration is the more appealing option.

What’s changed versus the Ultra 3

In short: the new Health Sensing System measures heart rate sixty times and HRV 24 times more often than before, a daily Readiness Score is new, Audio Intelligence is new (though it doesn’t arrive until later this year), the S11 chip replaces the previous generation’s chip, and battery life goes from 42 to 50 hours of normal use (84 hours in Low Power Mode). Display, case, dimensions, and weight remain virtually identical to the Ultra 3, and the price stays the same at $799.

Early impressions

Initial hands-on reactions are largely positive about the new heart rate sensors and the longer battery life, and several reviewers single out the Live Rewind feature as a pleasant surprise. There are criticisms too: the display is identical to the Ultra 3’s and, at 3,000 nits, still falls short of Samsung’s Galaxy Watch Ultra 2 at 5,000 nits, and the case remains a sizable 49 by 44 millimeters for an average wrist.

Our take

At Analyst ICT, what makes the Apple Watch Ultra 4 interesting to us is the combination of a noticeably longer battery life and more extensive health monitoring, without any price increase. For business use where employees spend a lot of time outdoors, think field service, construction, or safety roles, the longer battery life and satellite emergency features are a real benefit. The lack of offline maps isn’t a dealbreaker for most business use cases, but for teams genuinely working in remote areas, a Garmin is still worth considering.

Considering deploying the Apple Watch Ultra 4 within your organization, for example for health monitoring or the safety of field staff? We’re happy to think it through with you.