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Turn on Low Power Mode when you need maximum runtime, or make a narrower change by disabling Always On and reducing background refresh. For long outdoor workouts, reduce GPS and heart-rate sampling; keep the watch near its paired iPhone when possible; and check Battery Health if poor runtime persists for several days.
What Apple’s battery estimates actually mean
Apple rates Apple Watch Series 10 for up to 18 hours of normal use or up to 36 hours in Low Power Mode. Those are controlled estimates, not guarantees for every owner. Apple tested pre-production Series 10 GPS and GPS + Cellular watches paired with an iPhone in August 2024. Actual battery life varies with use, configuration, mobile network, signal strength and other factors.
| Apple estimate | Test profile | How to interpret it |
|---|---|---|
| Up to 18 hours, normal use | 300 time checks, 90 notifications, 15 minutes of app use and a 60-minute workout with Bluetooth audio over 18 hours | A laboratory-style usage profile; your result can be lower or higher. |
| Up to 36 hours, Low Power Mode | 600 time checks, 180 notifications, 30 minutes of app use and a 60-minute workout with Bluetooth audio over 36 hours | Uses Apple’s Low Power Mode test conditions and does not describe the runtime of every individual setting. |
The two estimates are not a promise that switching one control will double your personal runtime. The Low Power Mode test also uses a different pattern of time checks, notifications and app use, so it should be read as a separate controlled scenario. Someone who uses cellular data, streams audio, exercises with GPS for hours or receives many notifications can see a different result from someone who mainly checks the time.
Apple does not publish an extra-hours figure for disabling one particular feature. Treat each change below as a trade-off rather than a promised amount of additional time.
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Use Low Power Mode when runtime matters most
Low Power Mode is the broadest built-in battery-saving option. It turns off or limits several functions at once, so it is most useful when you need the watch to last through a long day, travel period, event or workout and can accept reduced background activity.
Turn it on from Control Center
- Press the side button to open Control Center.
- Tap the battery percentage.
- Turn on Low Power Mode.
You can also open Settings > Battery > Low Power Mode and activate it there. Depending on the watchOS version, the setting may offer a duration such as “Turn On” or a timed period. If you choose a timed duration, it follows that choice; otherwise, Low Power Mode turns off automatically when the battery charge rises above 80 percent.
That automatic behavior matters if you use the mode overnight or while charging: it may not remain enabled after the watch passes 80 percent unless you selected a duration. Check the battery control again before leaving if you need the reduced-power settings for the next part of the day.
What changes in Low Power Mode
To reduce power use, the mode disables Always On and background heart-rate and blood-oxygen measurements. It can limit some Wi-Fi and cellular behavior, and notifications may arrive later. Some health measurements and connected features therefore will not be available in the same way as they are during normal use.
Apple warns that some emergency alerts may not arrive while Low Power Mode is active. Do not use the mode without considering whether you need immediate alerts, continuous health measurements or reliable cellular connectivity. Turn it off when those functions are more important than maximum runtime. If you are relying on the watch away from your iPhone, confirm that the loss of some cellular behavior is acceptable before enabling it.
Low Power Mode is therefore best viewed as a situation-specific switch, not necessarily a permanent default. Use it for a day when a charger is unavailable, then return to normal operation when full measurements, immediate notifications and the usual connection behavior matter more.
Turn off Always On for a more focused change
If you want to preserve most features but can accept a dark display when your wrist is down, disable Always On instead of using the broader Low Power Mode setting. This is the most focused first step for owners who mainly notice that the display is frequently visible.
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- On the watch, open Settings.
- Tap Display & Brightness.
- Tap Always On.
- Switch Always On off.
The display already dims when your wrist is down. With Always On disabled, the screen remains off until you raise your wrist, tap it or use another wake gesture. Series 10 can update information more often while the wrist is down than older models, but those dimmed updates still consume power when Always On is enabled.
If you keep Always On, Apple lets you limit what appears in the dimmed state. You can reduce complication data, apps, notifications or Live Activities shown while the watch is dimmed. This is useful when you want at-a-glance information but do not need every data source refreshed continuously. It also lets you retain a visible clock while removing some of the information that would otherwise keep changing.
Choose this option when you still want normal notifications and health features. The cost is convenience: you must raise or tap the watch to see the display rather than glancing at a persistent dimmed screen.
Reduce Background App Refresh without making every app stale
Background App Refresh lets apps update information when you are not actively using them. Turning it off can reduce background activity, but a global switch may delay information you rely on, such as weather or transport updates.
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- Tap General.
- Tap Background App Refresh.
- Turn off refresh for individual apps, or disable Background App Refresh globally.
Selective changes are usually the better compromise: leave refresh enabled for apps whose information must be current and disable it for apps you rarely open. Those apps can show older information until you open them again. A global change is simpler, but it also affects every app that depends on background updates.
Apple notes that complications on the current watch face continue to refresh even when Background App Refresh is off. A face packed with weather, calendar, activity or other data complications can therefore continue to generate updates. Remove complications you do not need if the face itself is a major source of changing information. Simplifying the face is separate from the Background App Refresh switch and may be necessary when you want fewer visible data updates.
Extend battery life during long outdoor workouts
GPS tracking and frequent heart-rate readings can use substantial power during a long outdoor walk, run or hike. Series 10 supports a reduced-reading option when it is running watchOS 9.1 or later; Apple says the feature is also supported on Series 8 and later.
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Enable the workout-specific settings
- Open Settings on the watch.
- Tap Workout.
- Turn on Low Power Mode.
- Turn on Fewer GPS and Heart Rate Readings.
This combination reduces how often the watch samples location and heart rate, which can extend battery use on a lengthy outdoor session. It also changes the workout data you receive. Apple’s guidance says alerts, splits and segments are turned off, and current pace may be unavailable when the reduced-reading feature is active.
Use full sampling for races, interval sessions, navigation-dependent hikes or any workout where detailed pace and heart-rate history matters. Use fewer readings for a recreational outing where finishing with charge is more important than maximum data detail. Check the setting before an important workout so a previous battery-saving choice does not remove data you expected to record.
This is a workout-specific compromise rather than a general replacement for Low Power Mode. It addresses the periods when GPS and heart-rate sampling are active, while the other settings in this guide address display, app, connection and background activity outside the workout.
Choose the most efficient connection available
The watch uses less power when it can communicate efficiently rather than repeatedly searching for a connection.
- Stay near the paired iPhone when practical. Apple identifies a Bluetooth connection to the paired iPhone as the most efficient arrangement.
- Prefer Wi-Fi to cellular when the iPhone is away. Wi-Fi generally uses less power than a mobile network for the watch’s data connection.
- Avoid weak-signal locations when you can. Poor signal strength makes the watch work harder and can reduce runtime.
- Use Airplane Mode when connectivity is unnecessary. It is particularly useful in places with no coverage or a constantly changing weak signal, provided you do not need calls, messages, alerts or other network functions.
These choices involve convenience. Cellular freedom is useful when you leave the iPhone behind, while staying near the phone or using Wi-Fi favors battery efficiency. Airplane Mode is most useful when the watch would otherwise keep looking for a usable network; it is not appropriate if you need network-dependent functions or emergency communication.
Use Bluetooth headphones instead of the built-in speaker for audio
Playing audio through the Apple Watch’s built-in speaker can drain the battery faster than using Bluetooth headphones. For a long workout or extended listening session, pair Bluetooth headphones and keep the watch’s speaker for occasional prompts or calls.
Audio playback also appears in Apple’s Series 10 test profiles, which is why your listening habits can materially change the result compared with someone who only checks the time and receives notifications. A test result that includes a 60-minute Bluetooth-music workout cannot be applied directly to every listening pattern or speaker volume.
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Diagnose a sudden battery drop after a watchOS update
A watch can use extra power for a short period after a watchOS update while background tasks finish. The watch may appear ready to use even though this work is still running.
- Note when the update finished and keep using the watch normally for several days.
- After that period, compare the battery behavior with your usual routine.
- If the drain remains unusually high, check Battery Health rather than repeatedly changing unrelated settings.
Apple recommends waiting a few days before judging post-update battery life. A persistent problem after that interval deserves a health check and, if necessary, Apple Support. Changing several settings immediately can make it difficult to identify whether the update-related work simply needed time to finish.
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Check Battery Health and Maximum Capacity
- Open Settings on the watch.
- Tap Battery.
- Tap Battery Health.
Review Maximum Capacity. Apple defines this percentage as the battery’s capacity relative to when it was new. A lower capacity means the battery can hold less energy between charges, even when all settings are configured efficiently.
Battery life is a combination of the watch’s age, remaining capacity, features and the way you use it. A setting can reduce current power consumption, but it cannot restore capacity lost through normal battery aging. If the screen displays Battery Needs Service, or you suspect the battery requires replacement, contact Apple Support rather than attempting an improvised replacement.
A practical choice for common situations
| Situation | Recommended setting | Cost to functionality |
|---|---|---|
| You need the longest possible runtime today | Low Power Mode | Always On and some background health measurements are disabled; some connections may be limited and notifications can be delayed. |
| You mainly want the screen dark while your wrist is down | Turn off Always On | No persistent dimmed display; you must raise or tap the watch to see the screen. |
| Only a few apps need updating in the background | Disable Background App Refresh for selected apps | Those apps may show older information until opened; complications can still refresh. |
| You are walking, running or hiking for several hours | Workout Low Power Mode plus Fewer GPS and Heart Rate Readings | Less frequent sampling; alerts, splits and segments are disabled and current pace may be unavailable. |
| Your iPhone is nearby | Keep the watch connected by Bluetooth | Less freedom to leave the phone behind, but the connection is more efficient. |
| You are in a weak-signal area and do not need connectivity | Airplane Mode | Calls, messages, emergency and other network-dependent functions are unavailable while enabled. |
| You listen to audio for a long period | Use Bluetooth headphones | You need paired headphones instead of relying on the built-in speaker. |
Avoid common battery-saving mistakes
- Do not treat the 18-hour or 36-hour figure as a personal guarantee. Apple’s numbers come from specified test profiles, and your network, signal, settings and habits differ.
- Do not expect one toggle to provide a published number of extra hours. Apple documents the direction of the savings, not an individual-setting runtime gain.
- Do not assume Low Power Mode is consequence-free. It can delay notifications, limit some connections and disable background heart-rate and blood-oxygen measurements; some emergency alerts may not arrive.
- Do not leave reduced workout sampling on by accident. Check Workout settings before an important session if you need full pace, split or segment data.
- Do not assume Background App Refresh controls every update. Current-watch-face complications can continue refreshing.
- Do not diagnose an update-related drain immediately. Allow several days for post-update background work to finish.
- Do not confuse faster recharging with longer battery life. Apple’s fast-charge claim concerns time to recharge, not the number of hours the watch runs afterward.
- Do not assume Airplane Mode is a universal fix. It saves the watch from unnecessary network searching only when you can safely give up calls, messages, alerts and other connectivity.
Charging when you need to recover quickly
Apple says Series 10 can reach up to 80 percent charge in about 30 minutes when using the included magnetic fast-charger cable and the specified adapter and test setup. That is a charging-speed estimate, not additional runtime between charges. Actual results can differ from the controlled setup.
Use charging as a recovery step when a low battery threatens your schedule, but address unusually short runtime with the settings and Battery Health checks above. A charging stand, magnetic cable or power bank can make recharging more convenient, but none makes the watch last longer between charges. If Battery Needs Service appears, Apple Support is the appropriate next step rather than an improvised battery replacement.
The shortest reliable plan
- For an immediate maximum-runtime day, activate Low Power Mode from Control Center.
- If you need normal notifications and health features, turn off Always On instead.
- Disable Background App Refresh for apps that do not need live information, and simplify a complication-heavy watch face.
- For a long outdoor workout, enable Low Power Mode and Fewer GPS and Heart Rate Readings only if reduced data detail is acceptable.
- Keep the watch near the paired iPhone or use Wi-Fi, and avoid weak cellular coverage when connectivity is not needed.
- Use Bluetooth headphones for extended audio rather than the built-in speaker.
- After a watchOS update, wait several days before deciding the drain is abnormal; then inspect Battery Health and contact Apple Support if the problem continues.
Frequently Asked Questions
Why is my Apple Watch Series 10 battery draining so quickly?
Check whether the change began after a watchOS update, whether cellular service is operating in a weak-signal area, and how often you use GPS workouts, audio or the display. After an update, wait several days for background work to finish. If drain remains unusually high, review Settings > Battery > Battery Health > Maximum Capacity and contact Apple Support if Battery Needs Service appears.
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Turn on Low Power Mode from Control Center by tapping the battery percentage, then enable it. It disables Always On and background heart-rate and blood-oxygen measurements, may limit some Wi-Fi or cellular behavior, delay notifications and prevent some emergency alerts, so use it only when those trade-offs are acceptable.
Can I save power without turning on Low Power Mode?
Yes. Turn off Always On under Settings > Display & Brightness > Always On, and disable Background App Refresh for selected apps under Settings > General > Background App Refresh. Complications on the current watch face can still refresh even when app refresh is off.
How can I make a long GPS workout use less battery?
Under Settings > Workout, turn on Low Power Mode and Fewer GPS and Heart Rate Readings. On Series 8 and later with watchOS 9.1 or later, this reduces sampling, but alerts, splits and segments are turned off and current pace may be unavailable.
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Does keeping my iPhone nearby help Series 10 battery life?
Apple identifies a Bluetooth connection to the paired iPhone as the most efficient arrangement. When the iPhone is away, Wi-Fi generally uses less power than a mobile network, and weak cellular signal can reduce runtime.
Does the 30-minute fast-charge figure mean the battery lasts longer?
No. Apple’s claim of up to 80 percent charge in about 30 minutes describes recharge speed with the specified cable, adapter and test setup. It does not promise additional hours between charges.
The Bottom Line
Start with Low Power Mode when maximum runtime matters, or turn off Always On for a narrower change. Limit background refresh, reduce GPS and heart-rate readings for long outdoor workouts, use efficient Bluetooth or Wi-Fi connections, and wait several days after an update before diagnosing drain. Persistent short runtime or a Battery Needs Service message calls for a Battery Health check and Apple Support.
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