Yellow battery means Low Power Mode is on

When your iPhone's battery icon turns yellow instead of green or red, it means Low Power Mode is active. This is a setting you (or someone else with access to your phone) turned on deliberately — it is not a warning about a hardware problem. Low Power Mode reduces how hard your phone works so the battery lasts longer before it needs charging.

The yellow color is Apple's way of telling you that your phone is running in a restricted state. Some features work differently or not at all when Low Power Mode is on. You can turn it off anytime in Settings, and the icon will return to its normal color.

Key Takeaways

  • A yellow battery icon means Low Power Mode is turned on, not that your battery is failing or damaged.
  • Low Power Mode reduces performance and disables some features (background app refresh, automatic downloads, visual effects) to extend battery life.
  • You can turn Low Power Mode off in Settings > Battery > Low Power Mode, and the icon will return to normal when ready.
  • Low Power Mode turns off automatically when your battery reaches 80% after charging, unless you manually keep it on.
  • A red battery icon (not yellow) means your battery is critically low and your phone may shut down soon.

How Low Power Mode changes what your phone does

When Low Power Mode is on, your iPhone intentionally slows down some operations to use less power. Background app refresh stops — apps do not check for new messages or updates when you are not using them. Automatic downloads pause, so new photos and app updates wait until you plug in or turn Low Power Mode off. Visual effects like animations and transitions become simpler.

Mail fetch happens less often. If you have set Mail to check every 15 minutes, Low Power Mode may stretch that to every 30 minutes or longer. Hey Siri still works, but some Siri features may be slower. 5G switches to LTE on compatible phones. Video playback quality may drop slightly.

Despite these changes, you can still make calls, send texts, browse the web, and use most apps normally. The restrictions are designed to be noticeable enough that you know the mode is on, but not so severe that your phone becomes unusable.

When Low Power Mode turns on and off automatically

Your iPhone can turn Low Power Mode on by itself when the battery drops to 20%. If you have enabled this automatic feature in Settings, you will see the yellow icon appear without doing anything. This is a safety net — it gives you extra time to find a charger before the battery dies completely.

Low Power Mode turns off automatically when you charge your phone to 80%. If your battery is at 79% and you plug in, the mode stays on until you reach 80%. You can also turn it off manually at any point, even if your battery is at 5%, by going to Settings > Battery > Low Power Mode and toggling it off.

Where to turn Low Power Mode on or off

Open Settings on your home screen. Tap Battery. You will see a toggle switch next to "Low Power Mode" — it will be green when the mode is on. Tap the toggle to turn it off. The yellow battery icon will disappear when ready and return to green (if your battery is above 20%) or red (if it is below 20%).

You can also control Low Power Mode from Control Center. Swipe down from the top-right corner of your screen (or up from the bottom on older iPhones). Look for the battery icon with a lightning bolt inside it. Tap it to toggle Low Power Mode on or off.

The difference between yellow, green, and red battery icons

A green battery icon means your phone is fully charged or has plenty of power left, and Low Power Mode is off. A yellow battery icon means Low Power Mode is on — your battery may be at any level, from full to nearly empty. A red battery icon means your battery is critically low (usually below 20%) and your phone may shut down soon, whether or not Low Power Mode is on.

If your battery icon is red and you do not have Low Power Mode on, your phone is straightforward running low on power. Plug it in as soon as you can. If your battery icon is red and Low Power Mode is on, your phone is both low on power and in restricted mode — you should charge it when ready.

Why your battery icon might stay yellow even after charging

If you charge your phone to 100% and the battery icon is still yellow, Low Power Mode is still on. Charging does not turn off Low Power Mode automatically — only reaching 80% does. To remove the yellow icon, you must manually turn off Low Power Mode in Settings > Battery, or wait until your next charge cycle reaches 80%.

Some people leave Low Power Mode on intentionally to extend battery life throughout the day, even when their phone is fully charged. If this is your situation, the yellow icon is normal and expected. If you want the icon to go away, turn off Low Power Mode in Settings.

Frequently Asked Questions

Does a yellow battery icon mean my battery is damaged?

No. Yellow means Low Power Mode is on, not that your battery is failing. If you turn off Low Power Mode and the icon becomes green or red, your battery is working normally. A damaged battery would show other signs like unexpected shutdowns or very fast power drain, not just a yellow icon.

Will Low Power Mode hurt my battery if I leave it on all the time?

No. Low Power Mode is a software setting that reduces how hard your phone works — it does not damage the battery itself. In fact, using Low Power Mode regularly may help your battery last longer overall because it reduces the number of charge cycles your phone goes through.

Can I use my phone normally with Low Power Mode on?

Yes. You can make calls, text, browse the web, and use most apps without problems. Some features like background app refresh and automatic downloads are paused, and animations are simpler, but the phone is still fully usable for everyday tasks.

Why did Low Power Mode turn on by itself?

If you enabled automatic Low Power Mode in Settings, your phone turns it on when the battery reaches 20%. You can turn off this automatic feature in Settings > Battery and toggle off "Low Power Mode" to prevent it from activating on its own in the future.

What should I do if the battery icon is red instead of yellow?

A red icon means your battery is critically low, regardless of whether Low Power Mode is on. Plug your phone into a charger as soon as possible. Your phone may shut down within minutes if the battery drains completely.