Your iPhone shows a yellow battery icon when the device enters Low Power Mode

The yellow battery icon appears because your iPhone has automatically switched into Low Power Mode to extend how long the device can run before it needs to charge. This happens when your battery level drops to 20 percent, though you can also turn Low Power Mode on manually at any battery level.

Low Power Mode reduces performance and limits background activity to make your battery last longer. Your iPhone will slow down slightly, some visual effects will be reduced, and apps will refresh less frequently in the background. The yellow color is straightforward Apple's way of telling you the device is in this power-saving state.

Key Takeaways

  • A yellow battery icon means Low Power Mode is active, which happens automatically when your battery reaches 20 percent.
  • You can turn Low Power Mode on or off manually at any battery percentage through Settings or Control Center.
  • Low Power Mode slows your iPhone slightly but extends battery life by reducing background activity and visual effects.
  • The yellow icon disappears once you charge your phone above 80 percent or turn off Low Power Mode.
  • Low Power Mode does not damage your battery or harm your iPhone in any way.

How to turn Low Power Mode off

If you want to return your iPhone to full performance, you can disable Low Power Mode in two ways. The fastest method is to swipe down from the top-right corner of your screen to open Control Center, then tap the battery icon labeled "Low Power Mode" to turn it off. The icon will no longer be yellow once you do this.

The second method is to go to Settings, tap Battery, then toggle off the switch next to "Low Power Mode." Both methods work when ready, and your iPhone will return to normal speed and background activity right away. Your battery icon will turn green or white depending on your current charge level.

When Low Power Mode turns on automatically

Your iPhone enters Low Power Mode without asking when your battery drops to 20 percent. At 20 percent, you will see a notification asking if you want to turn it on, and if you tap "Enable," the yellow icon appears. If you do not respond to the notification, Low Power Mode will set up on its own when your battery reaches 10 percent.

Once you charge your phone above 80 percent, Low Power Mode turns off automatically and the yellow icon disappears. If you manually turned on Low Power Mode at a higher battery level, it will stay on until you turn it off, even as you charge the phone.

What Low Power Mode actually does to your phone

Low Power Mode makes several changes to reduce power use. Your iPhone's processor runs at a slower speed, which makes apps open slightly more slowly and animations appear less smooth. Mail stops fetching new messages in the background, photo library updates pause, and automatic downloads are paused. Bluetooth and location services continue to work, but background app refresh is limited.

These changes are temporary and do not harm your phone. Once you turn off Low Power Mode or charge above 80 percent, everything returns to normal. Your iPhone's performance and features are not permanently affected by using Low Power Mode, even if you use it frequently.

Why your battery drains to 20 percent quickly

If your battery reaches 20 percent several times a day, the issue is usually heavy use rather than a battery problem. Streaming video, using GPS navigation, or running demanding apps drains the battery faster than normal use. Older iPhones also drain faster than newer models because the battery capacity decreases over time.

If your battery drains unusually fast even during light use, check Settings > Battery > Battery Health & Charging to see the maximum capacity of your battery. If the capacity is below 80 percent, your battery is aging and may need replacement. You can also check which apps are using the most power in the same menu to see if a particular app is draining the battery unexpectedly.

The difference between yellow and red battery icons

A yellow battery icon means Low Power Mode is on. A red battery icon means your battery is critically low—usually below 10 percent—and your iPhone will shut down soon if you do not charge it. Red appears whether or not Low Power Mode is active.

If you see a red icon, plug in your charger when ready. Your iPhone will continue to work while charging, but it may shut down if you keep using it without power. Once the battery reaches 20 percent while charging, the icon will turn yellow again if Low Power Mode is still on.

Frequently Asked Questions

Does Low Power Mode damage my battery?

No. Low Power Mode does not harm your battery or iPhone. It straightforward reduces power use temporarily. You can use Low Power Mode as often as you want without any negative effects on battery health or device performance.

Why does my iPhone go into Low Power Mode even though the battery is not at 20 percent?

You likely turned on Low Power Mode manually. Check Control Center or Settings > Battery to see if the toggle is on. If it is, turn it off. If Low Power Mode keeps turning on by itself at higher battery levels, restart your iPhone to clear any software glitches.

Can I charge my phone while Low Power Mode is on?

Yes. Low Power Mode stays on while you charge, and your iPhone will charge normally. Low Power Mode will turn off automatically once your battery reaches 80 percent, or you can turn it off manually at any time.

Will turning off Low Power Mode make my battery last longer?

No. Turning off Low Power Mode will actually make your battery drain faster because your iPhone returns to full performance. Low Power Mode is designed to extend battery life, so keeping it on when your battery is low will make it last longer.