Your iPhone shows a yellow battery icon when Low Power Mode is on
The yellow battery icon appears because you have Low Power Mode enabled on your iPhone. This is not a sign of damage or a malfunction—it is a feature Apple built in to extend how long your phone runs on a single charge. When Low Power Mode is active, your iPhone reduces performance and limits background activity to use less power, and the battery icon turns yellow to remind you the mode is on.
Low Power Mode can turn on automatically when your battery drops to 20 percent, or you can turn it on manually at any charge level. The yellow color is straightforward Apple's way of telling you that your phone is running in this reduced-power state, not that your battery itself is damaged or failing.
Key Takeaways
- A yellow battery icon means Low Power Mode is currently active on your phone.
- Low Power Mode reduces performance and background activity to make your battery last longer.
- You can turn Low Power Mode on or off manually in Settings, or let it set up automatically at 20 percent battery.
- The yellow color is informational only and does not indicate a hardware problem with your battery.
- Turning off Low Power Mode will return your battery icon to white or red and restore full performance.
How to turn off Low Power Mode
Open Settings on your iPhone, then tap Battery. You will see a toggle switch next to Low Power Mode. Tap it to turn the mode off. The battery icon will return to white (if your charge is above 20 percent) or red (if it is below 20 percent).
You can also turn Low Power Mode off from Control Center. Swipe down from the top-right corner of your screen (or up from the bottom on older iPhones), find the battery icon, and tap it to toggle the mode off.
What Low Power Mode actually does to your phone
When Low Power Mode is on, your iPhone makes several changes to save power. It reduces the speed of your processor, limits how often apps refresh in the background, turns off some visual effects, and may reduce the brightness of your display. Mail stops fetching new messages automatically, and some features like iCloud Photos syncing pause until you turn the mode off or charge your phone to 80 percent.
These changes mean your phone will feel slightly slower—apps may take a moment longer to open, and downloads or uploads may take more time. For most everyday tasks like texting, calling, or browsing, you will not notice much difference. The trade-off is that your battery will last significantly longer, sometimes by several hours depending on how you use your phone.
Why your iPhone turned on Low Power Mode automatically
If you did not manually turn on Low Power Mode, your iPhone likely activated it automatically when your battery dropped to 20 percent. This is the default behavior on all iPhones. You can change this setting if you want to control when Low Power Mode turns on.
Go to Settings, tap Battery, then look for Low Power Mode. Below the toggle, you will see an option to choose when Low Power Mode activates automatically. You can set it to turn on at 20 percent (the default), at 10 percent, or never automatically. If you choose "never," Low Power Mode will only turn on when you manually enable it.
When to keep Low Power Mode on
Keeping Low Power Mode on is a reasonable choice if you are away from a charger for most of the day or if you use your phone heavily. Many people turn it on in the morning and leave it on until they can charge at night. The performance reduction is usually minor enough that it does not interfere with normal use.
Low Power Mode is also useful during travel, long workdays, or any time you know you will not have access to a charger soon. There is no harm in running your phone in Low Power Mode continuously—it does not damage your battery or shorten its lifespan. Your battery will straightforward last longer on each charge.
The difference between a yellow icon and a red one
A yellow battery icon means Low Power Mode is on. A red battery icon means your battery is critically low (usually below 10 or 20 percent, depending on your iPhone model) and you should charge soon. If your icon is red and Low Power Mode is also on, both conditions are true at once.
If your battery icon is red but Low Power Mode is off, your phone is straightforward running low on charge. Plug it in to charge, and the icon will return to white once your battery reaches a healthy level.
Frequently Asked Questions
Does Low Power Mode damage my battery?
No. Low Power Mode does not harm your battery or reduce its lifespan. It actually helps your battery last longer on each charge by using less power. You can use Low Power Mode as often as you want without any negative effects on your phone's hardware.
Will my phone charge faster if Low Power Mode is on?
Low Power Mode does not affect charging speed. Your phone will charge at the same rate whether Low Power Mode is on or off. The mode only reduces power consumption while your phone is in use, not while it is plugged in.
Can I use all my apps normally with Low Power Mode on?
Yes, all your apps will work with Low Power Mode on. Some may run slightly slower or take a moment longer to open, and background features like automatic mail fetching will pause. But you can use every app on your phone normally—nothing is blocked or disabled.
What if my battery icon stays yellow even after I turn off Low Power Mode?
If the icon remains yellow after you turn off Low Power Mode, restart your phone. Press and hold the power button, slide to power off, wait a few seconds, then turn it back on. If the icon is still yellow, go back to Settings and confirm that Low Power Mode is actually off—sometimes the setting does not register until you restart.
Is there a way to prevent Low Power Mode from turning on automatically?
Yes. Go to Settings > Battery, and change the automatic Low Power Mode setting to "never." After that, Low Power Mode will only turn on when you manually enable it. You can still turn it on anytime you want by going back to the same menu.