Apple announces Apple Watch Ultra 4 with longer battery life and smarter Health Tracking.

Apple has officially announced the Apple Watch Ultra 4, its newest smartwatch for endurance athletes, outdoor adventurers and anyone who wants more battery life than a regular Apple Watch can provide.

The design remains familiar, but the important upgrades are found underneath. A new Health Sensing System monitors heart rate and recovery more frequently, while the S11 chip powers a daily readiness score and Apple’s new Audio Intelligence features.

For me, however, the most meaningful Ultra 4 upgrade is battery life. Apple has finally given its adventure watch enough endurance for longer trips and ultramarathons without sacrificing frequent GPS measurements.

Battery life is the headline upgrade

Apple Watch Ultra 4 offers up to 50 hours of normal use—more than twice the 24-hour rating of Apple Watch Series 12. Low Power Mode extends this to as much as 84 hours.

Those figures make the Ultra much more practical for weekends away, long hikes and people who don’t want to charge their watch every day.

There are three outdoor workout modes:

• Standard tracking provides up to 18 hours.

• Extended Workout offers up to 25 hours.

• Max Extended Workout reaches up to 45 hours.

Apple says Max Extended Workout can track an outdoor run, walk or hike for as long as 45 hours while still taking a GPS reading every second. That could be enough for many 100-mile races.

Charging has improved as well. Fifteen minutes provides up to 18 hours of normal use, while a five-minute charge can supply enough power for approximately ten hours of sleep tracking. I really love this improvement.

More accurate heart-rate and recovery data

The Ultra 4 shares Apple’s new Health Sensing System with Apple Watch Series 12.

Its redesigned optical sensor measures heart rate every five seconds throughout the day. Apple says a study involving more than 1,000 participants found its system delivered the highest accuracy among the wearables included in the comparison.

Heart-rate variability, or HRV, is now measured up to 24 times more frequently. Apple divides the information into two categories:

• Recovery HRV focuses on daily stress and recovery.

• Overall HRV shows longer-term cardiovascular and health patterns.

Frequent readings should help athletes understand how their bodies respond to sleep, difficult training sessions, illness and everyday stress.

One measurement should never determine whether you train or rest. HRV is highly personal, so changes relative to your own baseline are usually more valuable than comparisons with other people.

Readiness brings the data together

Collecting more health information only matters when the watch can explain it clearly. Apple’s new readiness feature attempts to do exactly that.

Readiness combines recent activity, training load, sleep, heart rate, HRV and other vitals into a score between zero and ten. It then offers one of four recommendations:

• Recover

• Pace Yourself

• Ready

• Go For It

The score updates as new data arrives throughout the day. If you complete a difficult workout or your vitals move away from their normal range, the recommendation may change.

For athletes, this could be one of the Ultra 4’s most useful features. Instead of looking through several apps and charts, you receive a quick indication of whether your body appears ready for a demanding session.

I particularly like that Apple shows which factors influenced the score. Readiness should support your decision—not act like an unexplained number that tells you what to do.

GPS remains one of the Ultra’s biggest advantages

Apple says the Ultra 4 delivers the most accurate on-device GPS available in a sports watch.

It uses precision dual-frequency GPS alongside several satellite systems. Dual-frequency tracking helps reduce errors caused by trees, tall buildings, cliffs and other objects that can interfere with a satellite signal.

That matters when pace, distance and route accuracy are important. Runners should get cleaner tracks in cities, while hikers can use Backtrack, offline maps, custom waypoints and automatically generated waypoints marking their last cellular connection.

The Ultra 4 also provides satellite communication for Emergency SOS, Messages and Find My in supported regions. This doesn’t replace proper navigation tools or an emergency beacon for remote expeditions, but it adds a valuable layer of protection.

A tougher watch for demanding environments

Apple Watch Ultra 4 retains its large 49mm Grade 5 titanium case in Natural and Black finishes. It weighs approximately 63 grams before adding a band.

Its flat sapphire-crystal display reaches a stunning 3,000 nits of peak brightness and can dim to one nit at night. The customizable Action button provides quick access to workouts, the stopwatch, flashlight, shortcuts and other functions.

The Ultra 4 is water-resistant to 100 metres and certified for recreational scuba diving to 40 metres. It also carries an IP6X dust-resistance rating and has been tested against selected MIL-STD 810H environmental conditions. Very strong and very reliable.

Built-in outdoor tools include:

• A depth gauge and water-temperature sensor

• A compass with custom waypoints

• An 86-decibel emergency siren

• Precision Start for workouts

• Night Mode on supported Ultra watch faces

• Fall Detection and Crash Detection

• Offline and topographic maps in supported regions

These capabilities separate it from Apple Watch Series 12. Both watches offer similar health insights, but the Ultra is designed for longer and more demanding activities.

Step tracking receives a welcome improvement

Apple has redesigned its pedometer model using machine learning and the S11 chip. The company claims that Ultra 4 now offers the most accurate step tracking of any smartwatch.

Indoor walking and running distances should also become more accurate. A dedicated Steps complication finally allows users to place their live step count directly on the watch face.

This may not sound as impressive as satellite communication or 45-hour GPS tracking, but it addresses one of the most common requests from everyday Apple Watch users.

Audio Intelligence comes with privacy questions

Apple is bringing Audio Intelligence to Ultra 4 later this year

Sound Recognition can alert users to a doorbell, alarm, siren or maybe a crying baby. This has clear accessibility value for people who are deaf or hard of hearing.

Live Rewind converts the previous 15 seconds of a conversation into a short text snippet. Siri Recap can create a summary of selected conversations, while automatic Shazam recognition identifies nearby music.

These features are potentially helpful, but a watch that analyzes conversations will understandably make some people uncomfortable.

Apple says Audio Intelligence is optional and doesn’t store audio recordings. Raw sound is processed inside an isolated part of the S11 chip and immediately deleted. The system doesn’t identify speakers, while saved snippets and summaries are protected with end-to-end encryption.

Live Rewind also plays an audible sound and displays a visible notification when activated.

Those safeguards are important, although responsible use still matters. I would always inform another person before using a feature that processes a private conversation.

The redesigned Health app looks beyond daily activity

A redesigned Health app is coming to iPhone later this year.

Its Insights section summarizes information from sleep, fitness, readiness, heart rate, vitals and Cycle Tracking. A Longevity section examines longer-term trends, while Health Age compares selected measurements with expectations for your real age.

The idea is promising, but Health Age will need careful interpretation. A simplified age shouldn’t overshadow the individual metrics behind it or cause unnecessary concern.

The redesigned experience begins in U.S. English, and certain services—such as purchasing Quest Diagnostics laboratory tests inside the app—are limited to the United States.

Should you buy Apple Watch Ultra 4?

FOR MYSELF: YES. But the Ultra 4 is intended for a specific user. Its advantages become valuable when you exercise for many hours, regularly travel outdoors or simply need a watch that lasts more than one day.

It makes sense if you:

• Run marathons or ultramarathons

• Hike, cycle, dive or train outdoors frequently

• Need accurate GPS in challenging environments

• Want satellite safety features

• Prefer a large, bright and durable display

• Want Apple’s best battery life

• Plan to use readiness and recovery data seriously

For normal workouts, notifications, sleep tracking and everyday health information, Apple Watch Series 12 offers many of the same features for half the starting price. And that is very interesting.

If you already own a recent Apple Watch Ultra, the decision largely comes down to battery life and the improved Health Sensing System. The design itself hasn’t changed dramatically.

Price and availability

Apple Watch Ultra 4 starts at $799 in the United States. It is available in Natural Titanium and Black Titanium.

Preorders are open now, with in-store availability beginning September 18.

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