The Tool Desk
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Menu labels and paths can vary by watchOS version. Apple’s battery figures below apply specifically to Apple Watch Ultra 4 and are estimates, not a promise for other Ultra models or individual use.
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Choose the battery setting that fits the outing
There is no established number of extra hours for any one setting: Apple describes what the controls change but does not quantify each toggle’s individual battery gain. Choose based on which features you are willing to give up.
| Setting | What changes | Best fit |
|---|---|---|
| Low Power Mode | Limits or disables selected functions, including Always On display, background heart-rate and blood-oxygen measurements, and heart-rate notifications. Other notifications may be delayed, emergency alerts may not arrive, and some cellular and Wi-Fi connections are limited. Cellular can be turned off until needed. Apple Support | When maximizing runtime matters more than having every feature and connection available. |
| Always On off | The display no longer stays visible while your wrist is down. Raise your wrist or tap the screen to wake it. Apple says turning Always On off can increase battery life. Apple Support | When you want a display-specific adjustment but prefer not to use Low Power Mode. |
| Background App Refresh off, globally or per app | Reduces background refreshing, which uses power. Complications on the active watch face may still refresh even if background refresh is disabled for their apps. Apple Support | When you want to target apps you do not need updating in the background. |
Use Low Power Mode for broad savings
To enable it, open Settings on the watch and tap Battery, then Low Power Mode. Review the on-screen description before confirming: this is a broad endurance option, not a single-function battery switch. If cellular is unnecessary on the outing, turning it off until needed can reduce power use further.
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For a model-specific reference, Apple lists up to 50 hours of normal use and up to 84 hours in Low Power Mode for Apple Watch Ultra 4. These are Apple’s estimates for that model. Apple says battery life varies with use, configuration, cellular network and signal strength, among other factors; they do not establish what an earlier Ultra or your watch will achieve. Apple Watch Ultra 4 technical specifications
Turn off Always On for a narrower trade-off
On the watch, open Settings, tap Display & Brightness, then Always On, and switch it off. You will need to raise your wrist or tap the screen to see the active display. Always On is unavailable while Low Power Mode is on, so this is a separate choice for when you are not using that mode.
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Limit background refresh selectively
Open Settings on the watch, tap General, then Background App Refresh. You can turn refresh off for individual apps or disable it entirely. Consider leaving it enabled for apps whose complications you rely on: a complication on the active face may continue refreshing regardless of the app’s background-refresh setting.
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Reduce readings during long outdoor workouts
For long outdoor walking, running or hiking workouts, Apple recommends Low Power Mode together with Fewer GPS and Heart Rate Readings. With Low Power Mode active, starting one of these workouts can enable the reduced-reading behavior. The watch takes GPS and heart-rate readings less often, and turns off alerts, splits and segments. That means less detailed workout data and fewer prompts in exchange for longer battery use. Apple Support: extend battery life
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Apple’s Ultra 4 specifications list up to 18 hours for an outdoor workout, up to 25 hours for Extended Workout and up to 45 hours for Max Extended Workout. Extended Workout uses Low Power Mode; Max Extended Workout also turns off alerts and splits and makes some metrics unavailable. Apple says these tests used preproduction Apple Watch Ultra 4 models in July and August 2026, and actual results vary. The figures are model- and test-specific, not forecasts for earlier generations or all workout conditions. Apple Watch Ultra 4 technical specifications
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Make outdoor actions quicker to reach
Assign the Action button to your most-used task
Set the button up for the task you are most likely to need without navigating menus. On the watch, open Settings, tap Action Button, then choose an action and configure its available options. Supported choices include Workout, Waypoint, Backtrack and Dive. Workout can open or start a selected workout; Waypoint saves a Compass location; Backtrack records a route. If you use several actions, configure Quick Switch to expose selected alternatives. Labels and availability may differ by watchOS release. Apple Support: use the Action button
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Set up Compass before you need it
Compass can show bearing, location and elevation, save waypoints, and support retracing a recorded route with Backtrack. Familiarize yourself with the controls and record a route before relying on it in unfamiliar terrain. A location shown by the compass is a navigation aid, not a substitute for a planned route or appropriate safety equipment. Apple Support: use Compass
Some waypoint features involving cellular service or emergency calls are approximate and depend on surroundings and conditions; emergency-call waypoint availability is limited by region. Do not treat a waypoint as guaranteed connectivity or rescue.
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Prepare the watch before heading out
- Choose a face that shows the complications you actually need, and remember that active-face complications may refresh even when their apps’ background refresh is off.
- Set the Action button before the outing, then confirm it opens the task you intended.
- For an extended outdoor workout, decide whether reduced GPS and heart-rate readings—and the loss of alerts, splits and segments—are acceptable.
- Check your chosen settings and Compass behavior before you are away from reliable power or connectivity.
Battery estimates depend on model and use, and Apple’s published figures should not be read as guaranteed trip durations. The settings above let you trade glanceability, background activity, measurement frequency and alerts against endurance; which combination is right depends on what you need the watch to do outdoors.
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