To extend an Apple Watch Ultra’s battery life, turn off background refresh for apps that do not need frequent updates, disable Always On if you can live without it, and use Low Power Mode when you need the watch to last through a longer day. For long outdoor workouts, fewer GPS and heart-rate readings can reduce power use further. Each option trades some convenience, measurement detail, or connectivity for battery savings; none guarantees a specific runtime on an individual watch.
Start with settings that preserve the most functionality
Reduce Background App Refresh
On the watch, open Settings > General > Background App Refresh and switch off refresh for apps that do not need to update in the background. This can reduce background activity without disabling the app itself. Apple notes that complications on the current watch face may still refresh even when Background App Refresh is off. Apple’s battery-life guidance recommends reducing background refresh to help maximize battery life.
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Turn off Always On
Open Settings > Display & Brightness > Always On and turn the feature off. The display will no longer remain visible in its dimmed state; raise your wrist or tap the screen to check the time and watch face. Apple says disabling Always On can increase battery life. Apple’s Always On instructions explain the setting.
Use Low Power Mode when you need more time
To enable Low Power Mode, press the side button to open Control Center, tap the battery percentage, then choose Low Power Mode. Apple says the watch prompts you to turn it on when the battery reaches 10% or lower. On supported screens, you can also choose to enable it for one, two, or three days. Apple’s Low Power Mode instructions describe the available controls and effects.
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Low Power Mode is a broader trade-off than disabling Always On alone. Depending on the watch configuration, it turns off or limits Always On, background heart-rate and blood-oxygen measurements, selected heart-rate notifications, and connectivity. Notifications may be delayed; when the iPhone is away, calls and notifications may arrive less often. If you rely on a particular health measurement or alert, check whether it remains available in your configuration before enabling the mode.
| Choice | Battery-saving approach | What you give up |
|---|---|---|
| Turn off Always On | Stops the display from staying visible in its dimmed state | You must raise your wrist or tap to check the display |
| Low Power Mode | Reduces power use across several watch functions | Some measurements, notifications, display behavior, and connectivity are limited or less frequent |
| Fewer workout readings | Reduces GPS and heart-rate readings during supported outdoor workouts | Workout data may be less detailed |
The comparison is about function, not a promised number of extra hours: the runtime improvement varies with use and conditions.
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Reduce readings during long outdoor workouts
If you are going on a long outdoor walk, run, or hike, open Settings > Workout > Fewer GPS and Heart Rate Readings and enable the option. Apple says it takes effect when Low Power Mode is active and you start a supported outdoor workout. It reduces GPS and heart-rate sampling, so workout data may be less detailed than with normal readings. See Apple’s Low Power Mode guidance for the supported-workout behavior.
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- Prefer strong coverage. Apple recommends using the watch where Wi-Fi or mobile signal is strong when possible. Weak coverage can contribute to battery drain.
- Use Airplane Mode in a no-coverage location. If the watch will remain somewhere without useful signal, Airplane Mode can avoid repeatedly trying to connect. You will give up wireless connectivity while it is on.
- Use Bluetooth headphones for audio. Apple notes that playing audio through the built-in speaker can drain the battery more quickly. Apple’s troubleshooting guidance covers these conditions and other checks for rapid drain.
What the published Ultra 4 battery figures mean
Apple’s 2026 specifications for Apple Watch Ultra 4 list up to 50 hours of normal use and up to 84 hours in Low Power Mode. Apple’s testing used preproduction Ultra 4 devices in July and August 2026; actual results vary with use, configuration, network, signal strength, and other factors. Apple also lists up to 18 hours for an outdoor workout, tested without an iPhone and with the heart-rate sensor on. These are model-specific test figures, not guarantees for every Ultra generation or every wearer. Apple Watch Ultra 4 technical specifications provide the test qualifications.
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If these changes do not help
If the watch continues to drain unusually quickly, follow Apple’s battery-drain troubleshooting steps. Rapid drain alone does not establish that the battery is defective, and settings changes cannot confirm battery health. A replacement magnetic charging cable is relevant if you need a spare or your existing cable is damaged, not as a way to make a healthy watch last longer between charges. Apple recommends the included magnetic charger for best results and also permits compatible third-party chargers; see Apple’s charging guidance.
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