Apple Watch Ultra 4 Lasted 79 Hours in Testing — Is It Worth £749?
An independent Apple Watch Ultra 4 test achieved 79 hours of battery life. Here is what UK buyers should know about its £749 price, Apple’s 50-hour rating, health features and delayed AI tools.
ViralGadgets | 25 October 2026 | UK buying analysis — not a hands-on review
The Apple Watch Ultra 4 promises better battery life, more detailed health data and new AI features. But a fresh independent review has exposed an awkward buying decision: the endurance improvements are real, while some of the headline AI tools still have not arrived.
In a review published on 23 October, The Guardian reported approximately 79 hours of battery life in its own everyday-use test. That is longer than the up to 50 hours Apple quotes for normal use — but it does not mean every owner will achieve 79 hours. Different test routines, settings and usage patterns can produce very different results.
For UK shoppers weighing up a £749 smartwatch, the more important question is whether its upgraded sensors, charging and recovery metrics justify buying a new watch — particularly if they already own an Ultra 3.
Apple Watch Ultra 4 UK price and availability
Apple launched the Ultra 4 in September 2026, with UK availability beginning on 18 September. Its official UK announcement lists a £749 starting price. The watch comes in natural and black titanium finishes, with several band choices.
That puts it firmly in premium smartwatch territory. Buyers should judge it against what they actually use: navigation, fitness tracking, safety features, iPhone notifications and battery life, rather than assuming the most expensive model is automatically the best fit.
Battery life: Apple's 50-hour rating versus a 79-hour test
Apple rates the Ultra 4 for up to 50 hours of everyday use, compared with up to 42 hours for the Ultra 3. The company also quotes up to 84 hours in Low Power Mode and says a 15-minute charge can provide up to 18 hours of normal use, depending on conditions.
The Guardian's reviewer obtained roughly 79 hours between charges in one real-world test and reported quicker charging than on previous models. That is encouraging, but it is an independent result under one person's conditions, not a new manufacturer battery specification or a guarantee for every customer.
Battery life can change significantly with GPS workouts, cellular reception, always-on display settings, notifications and sleep tracking. For runners and hikers, Apple also specifies separate workout modes: up to 25 hours in Extended Workout and up to 45 hours in Max Extended Workout, with trade-offs in the information and alerts available during exercise.
The practical takeaway: battery life is a credible reason to consider the Ultra 4, especially if charging every day is frustrating. But compare the modes you would actually use, rather than treating the biggest number as a universal promise.
The new health sensors may matter more than the AI headline
The Ultra 4 uses Apple's S11 chip and a redesigned Health Sensing System. Apple says its sensors can measure background heart rate every five seconds and capture heart-rate variability more frequently than earlier models.
Those measurements feed into new daytime vitals and recovery insights. The Readiness feature combines information such as recent activity, training load, sleep and physiological signals into a daily score intended to help users plan exertion and recovery.
These are wellness and training aids, not medical diagnoses. They may be useful for people following structured fitness plans, but buyers should not interpret an unusual score as a substitute for clinical assessment.
For someone whose existing Ultra already handles their workouts, the key question is whether more frequent readings and recovery guidance will change their daily decisions. If not, the upgrade may feel modest.
The missing feature: conversation-focused AI tools
One of the Ultra 4's more unusual promises is Audio Intelligence. Apple has described features including Live Rewind, intended to help a user revisit a short snippet of recent conversation, and Siri Recap, which aims to produce summaries of conversations when enabled.
However, Apple's UK product announcement says these two features are planned for beta availability later in 2026. The Guardian's 23 October review likewise found that the conversation features were not yet available to test.
There are further caveats. Apple says Live Rewind and Siri Recap require a compatible Apple Intelligence-enabled iPhone 16 or later, excluding the iPhone 16e, and that availability depends on language and region. Buyers should check current support before purchasing specifically for either feature.
Apple describes privacy controls for these tools, including opt-in use and a notification when Live Rewind is active. Those protections will be important to assess once the features become available, particularly because conversation assistance raises questions about bystanders' expectations of privacy.
Do not buy the Ultra 4 solely on the assumption that every advertised AI capability is already live.
Ultra 4 versus Ultra 3: should you upgrade?
Based on Apple's published specifications and 9to5Mac's model comparison, the clearest differences are longer rated battery life, faster top-ups, the updated sensor system and new readiness features.
The broad design and rugged positioning remain familiar. Owners of a functioning Ultra 3 who are happy with their charging routine and existing fitness metrics have relatively little reason to rush. Someone upgrading from a much older Apple Watch, on the other hand, may appreciate the combination of battery endurance, GPS, outdoor safety functions and health monitoring.
There is also a simpler alternative: shoppers who do not need the Ultra's outdoor-focused hardware should compare the less expensive Apple Watch range before spending £749. An Apple Watch is designed to work with an iPhone, so it is not a sensible purchase for someone planning to use it with an Android phone.
Our verdict: impressive endurance, but buy for what works now
The Ultra 4's strongest current selling point is not futuristic AI. It is the combination of better battery endurance, faster charging and richer fitness data in a familiar premium design.
The recent independent battery result adds useful real-world context to Apple's official specifications. Equally, the delayed conversation features are a reminder that an announced capability is not the same thing as a feature available on day one.
Our buying view: consider the Ultra 4 if you want Apple's most capable outdoor-focused watch and will benefit from its extra endurance. If you already have an Ultra 3, or are mainly interested in future AI conversation tools, waiting is the more cautious choice.
Editorial disclosure: This is an original source-based buying analysis. ViralGadgets has not independently tested the Apple Watch Ultra 4. The 79-hour figure is attributed to The Guardian's single independent test. The prepared editorial graphic depicts a generic watch, not a real Apple product photograph.