For a quick, targeted change, turn off Always On or restrict Background App Refresh for apps that do not need to update. For longer time between charges, use Low Power Mode—but expect changes to health measurements, connectivity, notifications, and background updates. For long outdoor workouts, you can also reduce GPS and heart-rate readings, with some workout information and alerts unavailable.
Choose a change that matches what you need
| Option | Best fit | Main tradeoff |
|---|---|---|
| Turn off Always On | You want the display change without enabling a broader power-saving mode. | The display is no longer always visible. |
| Limit Background App Refresh | You want to reduce background updates for selected apps. | Those apps may refresh less often; current watch-face complications can still refresh. |
| Low Power Mode | You need a broader reduction in power use. | Several watch features and background activities change, and some notifications may be delayed. |
| Fewer GPS and Heart Rate Readings | You are doing a long outdoor walk, run, or hike in the Workout app. | Some workout alerts, recorded details, and metrics are unavailable. |
Make targeted changes first
Turn off Always On
On the watch, open Settings > Display & Brightness > Always On and turn the feature off. Apple says disabling Always On can increase battery life. Low Power Mode also turns it off, but this setting lets you make the display change without enabling that broader mode.
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Restrict background refreshing
Open Settings > General > Background App Refresh. Turn off refresh for individual apps that do not need it, or disable it for all apps. Apple notes that apps represented by complications on the current watch face can still refresh, even when their background-refresh setting is off.
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On Apple Watch Ultra 3, press the side button to open Control Center, tap the battery percentage, then turn on Low Power Mode. You can also open Settings > Battery to enable it. Apple lets you choose a duration of one, two, or three days. Normally, Low Power Mode turns off automatically once the watch is charged to 80%; choosing a multi-day duration changes that behavior.
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Low Power Mode reduces power use, but it is not a no-cost battery setting. Apple lists effects that include turning off Always On and background heart-rate and blood-oxygen measurements, including during sleep. Some heart-rate notifications and gestures are also disabled. Background app refresh, complication updates, Live Activities, and Siri processing may happen less often or more slowly.
Connectivity can change too. When the paired iPhone is away, Wi-Fi and mobile data may be turned off until needed; calls and notifications may be delayed or retrieved periodically. Check Apple’s current Low Power Mode feature list for details that depend on software version or region before relying on a particular measurement, alert, or connection.
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Adjust connectivity for weak-signal situations
Apple advises using a strong Wi-Fi or mobile signal where possible: connections in strong-signal areas use less battery than those in weak coverage. If you expect to spend an extended period somewhere with weak Wi-Fi or no mobile coverage, Apple suggests Airplane Mode. Use it only when the connectivity tradeoff is acceptable; it is a situational measure, not a general setting to leave on.
Reduce GPS and heart-rate readings during long outdoor workouts
For outdoor walking, running, or hiking workouts in Apple’s Workout app, Apple supports Fewer GPS and Heart Rate Readings on Apple Watch Ultra and later. This option works when Low Power Mode is active and can extend use during long workouts. The available guidance does not establish a measured battery-life gain specifically for Ultra 3.
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Fewer readings also mean less workout functionality: workout alerts are turned off, splits and segments are not recorded, and metrics such as current pace are unavailable. Use this setting when longer runtime matters more than those alerts and details.
If the watch still drains unusually fast
There is no established Ultra 3-specific fault pattern in the guidance covered here, so unusually fast drain alone does not identify a particular cause. Check Apple’s battery troubleshooting and battery-status guidance for the current steps relevant to your watch and software, rather than assuming a setting or repair will solve it.
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What the available evidence can—and cannot—tell you
Apple’s support guidance explains which settings affect power use and how to change them, but it does not provide a measured number of hours saved by any of these steps on Apple Watch Ultra 3. Actual runtime improvement therefore cannot be quantified from this guidance; choose settings based on which features you are willing to trade away.
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