Keep your Apple Watch Ultra (first generation) if it still gets through your usual day and workouts; upgrade to Apple Watch Ultra 4 if its longer battery rating or watchOS 27 support solves a real problem. Apple rates the original for up to 36 hours of normal use and Ultra 4 for up to 50 hours. Apple’s model comparison lists the hardware differences.
What changes from Ultra 1 to Ultra 4
The biggest practical differences are the display, storage, battery ratings and reported software support. Apple lists these specifications for the two models:
| Feature | Apple Watch Ultra (first generation) | Apple Watch Ultra 4 |
| Display | LTPO2 OLED; up to 2,000 nits; 410 × 502 pixels; 1,185 mm² | Wide-angle LTPO3 OLED; up to 3,000 nits; 422 × 514 pixels; 1,245 mm² |
| Chip and storage | S8; 32 GB | S11; 64 GB |
| Battery, normal use | Up to 36 hours | Up to 50 hours |
| Battery, Low Power Mode | Up to 72 hours | Up to 84 hours |
| Charge from 0 to 80% | About 1 hour | About 45 minutes |
| Finish | Natural titanium | Natural or black titanium |
| watchOS 27 support | MacRumors reports that it is not supported | MacRumors reports that it is supported |
The higher peak-brightness rating gives Ultra 4 more headroom in bright surroundings. Its display also has a higher listed resolution and area. The S11 chip and 64 GB of storage replace the original’s S8 and 32 GB; Apple’s listed figures establish the hardware difference, not a measured speed gain.
For software, MacRumors reports that the first-generation Ultra cannot run watchOS 27, while Ultra 4 supports it. That matters if access to that release is part of your decision; the original can still be a sensible choice for the routine it already handles.
Battery life: Apple’s ratings and one road-trip comparison
Apple’s normal-use ratings differ by 14 hours: up to 36 hours for the original Ultra and up to 50 for Ultra 4. In Low Power Mode, Apple lists up to 72 and 84 hours, respectively. Ultra 4 is also rated to charge from zero to 80% in about 45 minutes, compared with about an hour for the original.
In his road-trip comparison, reviewer Samuel Nam reported 43 hours for the original and 71 hours 37 minutes for Ultra 4. Those are his individual results, not Apple’s ratings or a standardized battery benchmark. Samuel Nam’s comparison also follows his decision about whether the upgrade suited his needs.
Who should keep the original, and who should upgrade?
Keep the first-generation Ultra if its battery still covers your normal day and workouts and its current software features meet your needs. A newer chip and brighter display may be appealing, but the listed differences alone do not establish that you need to replace a watch that serves your routine.
Consider Ultra 4 if the original’s battery no longer lasts through your usual outings, a quicker charge would help, or you want watchOS 27 support. The larger Apple-rated battery maximum is a clear reason to look closer; Nam’s longer result offers one real-use observation, not a runtime to expect from every watch.
MacRumors reported a US starting price of $799 in its October 12, 2026 buying guide. That is a reported starting price, not a current retailer quote. Nam said the price did not make sense for his own basic sleep, workout and step-tracking needs, and chose Apple Watch Ultra 3 instead. The decision comes down to whether Ultra 4’s longer rated battery life or software support addresses a need your original watch no longer meets.
