“Battery anxiety” is a daily reality for many people. Although some phones now use silicon-carbon batteries, greatly improving battery life, no matter how large the battery is, the power will eventually run out—especially when there’s no charger nearby. At that point, “Low Power Mode” (or power-saving mode) becomes the savior for extending your phone’s battery life.
Is it really a good idea to leave “Power Saving Mode” on all day? Here’s an analysis of the pros and cons for you.
Typically, iOS and Android systems will prompt you to turn on power-saving mode or automatically turn it on when the battery drops below a certain percentage. This is supposed to be the correct way to use it, but if you keep it on all the time to save battery, is that a good idea? For phones with severely degraded batteries, keeping low-power mode on all day has indeed become a reluctant choice for many people. Although doing so won’t damage the phone or the battery itself, the cost is a significantly compromised overall user experience, and it may even be somewhat more trouble than it’s worth.
Operational smoothness has dropped significantly, and the experience is noticeably laggy.
One of the core strategies of power-saving mode is “limiting performance.”
- Display refresh rate is limited
Many phones today support high refresh rates, but after enabling power-saving mode, the refresh rate is usually locked at 60Hz or even lower. In testing, the iPhone’s Low Power Mode can even make the screen feel like it drops to around 30Hz; scrolling feels noticeably janky, interface animations become stiff, and the 3D gaming experience deteriorates significantly. - iOS performance and visual experience
Although it has little impact on raw compute performance such as app launch speed, photo editing, or video rendering, system-level animation smoothness drops sharply, making the phone feel sluggish. You may get used to it over time, but this is definitely not the quality experience iOS should deliver. - Android performs slightly better.
The performance of the Android lineup varies depending on each manufacturer’s tuning. Battery saver mode usually also disables haptic feedback (vibration feedback), so everyday interactions like typing and receiving notifications lose their physical feel.
Important notification delayed; background backup was forcibly interrupted.
Besides limiting the screen refresh rate, Low Power Mode also significantly tightens permissions for “Background App Refresh”:
- Notification delay
Although it doesn’t block all messages, notifications from email (such as the built-in Mail app on iPhone) and social media apps are highly prone to delays. On a OnePlus (OxygenOS) with battery saver enabled, you may not even receive messages from instant messaging apps like WhatsApp right away. - Cloud backup interrupted
Services such as Google Drive, Google Photos, and Apple iCloud rely heavily on background network transfers. When Low Power Mode is turned on, iCloud photo backups automatically pause, and if the phone is accidentally lost or damaged at that point, any photos and videos that have not yet been backed up may be impossible to recover. - App loading has become slow
Because background refresh is restricted, when you open social apps such as Instagram or TikTok, the latest feed has to reload, creating the illusion that your phone has slowed down.
System functionality is subject to multiple limitations.
Frequently using Low Power Mode also forcibly disables many useful features:
- Screen brightness and sleep
The system will actively lower the screen’s maximum brightness (especially noticeable when using it outdoors) and forcibly shorten the screen sleep timeout to 30 seconds. If you often read articles on your phone, you’ll need to tap the screen frequently to keep it from turning off. - Always-On Display not working
Although the AOD feature is convenient for checking the time and notifications, it drains more battery, so it is forcibly disabled in power-saving mode. - Network and location degradation
In Low Power Mode, iPhone disables most 5G connections, briefly enabling them only when downloading large files or streaming video. At the same time, the accuracy and update frequency of Location Services are reduced, affecting the accuracy of real-time location sharing.
The power-saving effect is actually not as good as expected.
The idea behind turning on power-saving mode was to significantly extend battery life—ideally, to last a few more hours—but the actual test results were disappointing.
- Power savings during use are limited.
Power-saving mode is most effective when your phone is on standby; however, when you frequently turn on the screen and use apps, the main power consumers—the display and processor operations—are still running, so the power saved by merely lowering the refresh rate is negligible. - Backed by empirical data
The well-known YouTube channel PhoneBuff once conducted a comparison test with two iPhone 12 units (one with Low Power Mode on and one off), and the difference in battery life between them was minimal. In my own hands-on testing with the iPhone 18 Pro, even though this model supports ProMotion adaptive refresh rate, turning on Low Power Mode still did not significantly improve the rate of battery drain; instead, it needlessly sacrificed the smooth animation experience.
How can you properly improve your phone’s battery life?
Keeping power-saving mode on all day comes at too high a cost and offers limited benefits. So how should you use this feature correctly, and how can you save power effectively?
- Let power-saving mode return to its original purpose.
Power-saving mode is most useful when the battery has only 10%–20% left in an emergency, or when the phone has been left on standby for a long time. - Manually manage 5G network
If you want to save power, you don’t need to keep Low Power Mode on all day. In iOS Settings, go to “Cellular” > “Voice & Data,” choose “5G Auto” or switch directly to “4G,” and turn off “5G Standalone (SA).” Android phones can also adjust the preferred network type in network settings. - Smarter everyday energy-saving habits:
- Manually turn off Always-On Display (AOD)
- Fully enable “Dark Mode”
- Manually check and turn off background data permissions for apps that don’t need to run in the background.
With these individual settings, you can achieve ideal power savings without sacrificing your phone’s smooth performance or important notifications.
Source: KOCPC Chinese