Apple Watch Ultra 4 Full Specs Push Battery, Satellite And AI

Apple Watch Ultra 4 now has its full official product details. Apple is making its toughest Watch more independent, more health-aware and more useful away from the iPhone.

Apple’s official Ultra 4 page says the new model delivers the longest battery life of any Apple Watch, with up to 50 hours of normal use, up to 84 hours in Low Power Mode, up to 18 hours of standard workout tracking and up to 45 hours of Max Extended Workout tracking.

The battery story matters because Ultra buyers are not casual smartwatch users. They are runners, hikers, divers, cyclists and endurance users who notice when a device cannot last through a long session. Apple is explicitly pitching Ultra 4 as capable enough for a 100-mile race under extended tracking.

The new Watch also adds built-in satellite communications, giving users a way to stay connected and safer off the grid. That pushes Ultra further into Garmin and adventure-device territory, where reliability outside normal cellular coverage is part of the buying decision.

Health sensing has been upgraded too. Apple says the all-new Health Sensing System uses redesigned optical and electrical sensors with larger, more power-efficient green LEDs, working with the S11 chip to deliver richer heart data. Background heart-rate readings now update every five seconds, and HRV readings can be sampled as often as every five minutes.

Ultra 4 also brings a readiness score, sleep score, training load, cycle tracking, blood oxygen measurements, hypertension notifications, ECG and heart-rate alerts. These are not all new ideas individually, but the combination shows Apple’s direction: the Watch is becoming a continuous health interpretation device, not just a fitness tracker.

The AI layer is Siri AI and Audio Intelligence. Apple says Ultra 4 can use Siri AI for more natural conversations, workout ideas and wellness tips from the wrist. Audio Intelligence features include Siri Recap, Live Rewind, Sound Recognition and automatic Shazam-style music recognition, with some features arriving in beta late 2026.

Design remains focused on durability. Ultra 4 comes in 49mm titanium cases in natural and black finishes, with sapphire crystal, MIL-STD-810H testing, WR100 water resistance for recreational scuba diving to 40 metres, high-speed water sports support and IP6X dust resistance.

The business angle is that Apple now has several AI surfaces from one event: iPhone 18 Pro for premium mobile AI, iPhone Duo for foldable productivity, AirPods 5 for translation and Apple Watch Ultra 4 for health and off-grid context.

Ultra 4 is not the flashiest Apple launch today, but it may be one of the clearest. Apple is moving AI into the places where users already generate personal data: movement, health, sound, location and routine. That makes privacy and trust central to the product, not a marketing footnote.