Low power mode is a built-in feature on phones, tablets, and laptops that stretches your remaining battery life by temporarily dialing back performance and pausing background tasks. When activated, your device reduces its processor speed, dims the screen, and stops non-essential activities like syncing photos or fetching new emails. The result is a device that does less behind the scenes so it can stay on longer.
What Changes When You Turn It On
Low power mode targets the biggest energy drains on your device: the processor, the screen, and background activity. Your processor slows down, running at roughly 60 to 70 percent of its full speed depending on the device. That means apps may take a beat longer to open and animations might feel less smooth, but everyday tasks like texting, browsing, and calling work fine.
Your screen gets dimmer automatically, and on phones with high-refresh-rate displays (like iPhones with ProMotion), the refresh rate drops from 120 Hz to 60 Hz. You won’t notice this in most situations, but scrolling and transitions look slightly less fluid. The screen also locks faster, typically after 30 seconds of inactivity on iPhones, to prevent the display from burning through battery while sitting idle.
Behind the scenes, the bigger savings come from what your device stops doing entirely. Apps that normally check for updates, sync data, or track your location in the background get paused or delayed. Your phone essentially stops doing work you haven’t explicitly asked it to do.
What Gets Disabled on iPhones
Apple’s Low Power Mode pauses a specific set of features, all of which resume once you charge back up or turn the mode off:
- Email fetch: Your phone stops automatically checking for new emails. You’ll see new messages only when you open the Mail app.
- Background app refresh: Apps can’t update their content in the background, so a news app or social feed won’t have fresh content until you open it.
- Automatic downloads: App updates and new purchases from other devices won’t download on their own.
- iCloud Photos: Photo syncing to iCloud pauses temporarily.
- Some visual effects: Certain animations and motion effects turn off to save processing power.
On iPhones, your device will prompt you to enable Low Power Mode when the battery drops to 20 percent. You can also turn it on manually at any time through Settings or by adding a toggle to Control Center. Once your phone charges past 80 percent, Low Power Mode turns itself off automatically.
How Android Handles It
Android calls its version Battery Saver, and it works on similar principles with a few differences in approach. When activated, it restricts background data usage, limits location services when the screen is off, and reduces or eliminates system animations. Some Android phones, like Pixels and Samsung Galaxy devices, also cap processor speed to around 70 percent of maximum.
Android gives you more granular control over individual apps. You can place specific apps in a “restricted” state, which fully prevents them from running in the background. Restricted apps can’t trigger alarms, run scheduled tasks, or start background services. This is more aggressive than the blanket approach on iOS, and it means those apps may not send you notifications until you open them directly.
Haptic feedback behavior has varied across Android versions. Older versions of Battery Saver used to disable vibrations entirely, which some people actually liked as a silent mode shortcut. Newer versions of Android (14 and later) keep haptic feedback on even in Battery Saver, a change that frustrated users who relied on the old behavior.
Low Power Mode on Laptops
Both macOS and Windows offer low power options for laptops. On a Mac, Low Power Mode reduces energy use to extend battery life, and starting with macOS Sequoia 15.1, it also reduces fan noise by capping how hard the processor works. This makes it useful not just for saving battery but for working in quiet environments like libraries or meetings.
Windows laptops offer similar battery-saving profiles through their power settings, typically reducing screen brightness, limiting background activity, and throttling the processor. The specifics vary by manufacturer, but the core idea is the same: trade peak performance for longer runtime.
How Much Battery It Actually Saves
The exact savings depend on what you’re doing with your device. If you’re mostly reading, messaging, or listening to music, low power mode can meaningfully extend your battery because those tasks don’t need full processor speed anyway. The display dimming alone saves a significant amount, since the screen is the single largest power draw on most devices.
Where you’ll feel the tradeoff most is in demanding tasks. Gaming, video editing, or anything that pushes the processor will feel noticeably slower. Benchmark tests on iPhones have shown roughly a 30 percent drop in CPU performance scores and about 15 percent for graphics. For casual use, that gap is invisible. For intensive use, it’s noticeable.
Does It Affect Long-Term Battery Health
Using low power mode regularly does not harm your battery. If anything, it may offer a small long-term benefit. Lithium-ion batteries degrade faster when exposed to heat, and low power mode reduces the workload on the processor, which in turn generates less heat. It also keeps the battery from draining as deeply between charges, and shallower charge cycles are gentler on lithium-ion cells over time.
Think of low power mode as a tool rather than a compromise. It doesn’t change anything permanently. Every feature it pauses comes back the moment you turn it off or plug in. There’s no downside to using it whenever you want to, whether your battery is at 15 percent or 85 percent.