Your iPhone is in Low Power Mode

A yellow battery icon means your iPhone has switched itself into Low Power Mode. This is not a warning that something is broken — it is a power-saving feature that kicks in automatically when your battery drops to 20 percent. The yellow color is Apple's way of telling you the phone is now running in a restricted state to stretch the remaining charge as far as possible.

Low Power Mode reduces performance, limits background activity, and turns off some features you normally use. Your phone will still work, but it will feel slower. Mail will not refresh automatically, downloads will pause, and some visual effects will disappear. The trade-off is that your battery will last significantly longer than it would at full power.

You can turn Low Power Mode off at any time by going to Settings > Battery, or by swiping down from the top-right corner of your screen, finding the battery percentage in Control Center, and tapping it. The icon will return to white or black once the mode is off.

Key Takeaways

  • A yellow battery icon means Low Power Mode is active, which happens automatically when your battery reaches 20 percent.
  • Low Power Mode slows your phone down and turns off background features to make your battery last longer.
  • You can disable Low Power Mode manually at any time through Settings or Control Center, even if your battery is still low.
  • The yellow icon will disappear as soon as you turn off Low Power Mode or charge your phone above 20 percent.

How Low Power Mode Affects Your Phone

When Low Power Mode is on, your iPhone stops doing things in the background that use power. Apps will not refresh their content unless you open them. Photos will not upload to iCloud automatically. Email will not fetch new messages on a schedule — it will only check when you open the Mail app. This is why your phone feels less responsive: it is intentionally holding back to preserve battery.

Some visual features also turn off. Animations become simpler, and some graphics effects disappear. If you use your phone for video calls, streaming, or gaming, you will notice the difference most clearly. The phone prioritizes staying on over staying fast.

Despite these restrictions, your phone remains fully functional for calls, texts, and basic tasks. You can still use most apps; they just will not update in the background or run as smoothly as usual.

When Low Power Mode Turns On Automatically

Your iPhone will offer to turn on Low Power Mode when your battery reaches 20 percent. You can accept or decline. If you decline, the phone will ask again at 10 percent. If you still decline, Low Power Mode will turn on automatically at 5 percent — you cannot prevent it at that point.

Once your battery drops below 20 percent and Low Power Mode is active, the yellow icon will stay until you either charge the phone above 20 percent or manually turn the mode off. Some people leave it on even after charging because they prefer the longer battery life, even at the cost of speed.

Turning Low Power Mode Off

The fastest way to disable Low Power Mode is through Control Center. Swipe down from the top-right corner of your screen (or up from the bottom on older iPhones), find the battery percentage icon, and tap it. The icon will turn white or black when ready, and your phone will return to full performance.

You can also go to Settings > Battery > Battery Health & Charging and toggle Low Power Mode off there. Either method works when ready. Your phone will not ask permission or require a restart.

If you want to prevent Low Power Mode from turning on automatically in the future, you can disable the feature entirely in Settings > Battery > Battery Health & Charging. Toggle off "Low Power Mode" to stop the automatic set up, though you can still turn it on manually whenever you choose.

Why Your Phone Uses So Much Battery

If you find yourself hitting Low Power Mode regularly, something on your phone is draining the battery faster than normal. Older batteries lose capacity over time, so an iPhone that is several years old will not hold a charge as long as a new one. You can check your battery health in Settings > Battery > Battery Health & Charging — if the maximum capacity is below 80 percent, the battery is aging.

Apps running in the background, location services, screen brightness, and network activity all drain the battery. If a particular app is the culprit, you can restrict its background activity in Settings > General > Background App Refresh. Turning off location services for apps that do not need it, reducing screen brightness, and disabling Wi-Fi or Bluetooth when you are not using them will also help.

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 5 percent — and your phone may shut down soon. A red icon does not necessarily mean Low Power Mode is active; it is straightforward a warning that you are running out of time to charge.

If you see a red icon, charge your phone as soon as possible. A yellow icon is less urgent — your phone will keep working for hours in Low Power Mode, depending on what you are doing.

Frequently Asked Questions

Can I use my iPhone normally while the battery icon is yellow?

Yes, your phone works normally, but slower. You can make calls, send texts, browse the web, and use apps. Background features like automatic email refresh and app updates are paused. If you need full speed, turn off Low Power Mode in Control Center, though your battery will drain faster.

Will Low Power Mode damage my battery?

No. Low Power Mode actually helps your battery last longer by reducing the strain on it. Using Low Power Mode regularly does not harm the battery or shorten its lifespan. It is a safe feature designed to extend how long your phone stays on.

Why does my phone keep turning on Low Power Mode even after I charge it?

Low Power Mode stays on until you manually turn it off, even after you charge your phone. Go to Control Center or Settings > Battery and toggle it off. If you want it to turn off automatically when you reach 80 percent charge, you will need to disable it manually each time.

Is a yellow battery icon a sign my battery is failing?

No. The yellow icon straightforward means Low Power Mode is active. If you see it frequently, your battery may be aging or something is draining power quickly, but the icon itself is not a failure warning. Check your battery health in Settings > Battery > Battery Health & Charging to see the actual condition.