A yellow battery icon means Low Power Mode is on

Your iPhone shows a yellow battery icon when Low Power Mode is active. This is a setting you or your phone turned on to extend battery life by reducing performance and limiting background activity. The yellow color is Apple's way of telling you the phone is running in a restricted state — it is not a warning that your battery is damaged or failing.

Low Power Mode kicks in automatically when your battery drops to 20 percent, unless you have turned off that automatic feature. You can also turn it on manually at any battery level if you want to make your charge last longer before you need to plug in.

The yellow icon disappears the moment you turn Low Power Mode off or charge your phone to 80 percent or higher. If your battery is above 20 percent and the icon is still yellow, Low Power Mode is on by choice — either yours or the phone's default setting.

Key Takeaways

  • A yellow battery icon means Low Power Mode is running, not that your battery is broken or unhealthy.
  • Low Power Mode turns on automatically at 20 percent battery unless you have disabled that setting in Battery settings.
  • You can turn Low Power Mode on or off manually from Control Center or Settings at any time, regardless of your current charge level.
  • The yellow icon disappears when you disable Low Power Mode or charge your phone to 80 percent or above.
  • Low Power Mode slows performance and limits background tasks, so your phone may feel less responsive while it is active.

How to turn Low Power Mode off

The fastest way 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 icon, and tap it. The icon will turn green, Low Power Mode will shut off, and the yellow battery icon will disappear when ready.

If you want to turn it off permanently and prevent it from turning on automatically, go to Settings, tap Battery, then Battery Health & Charging. Toggle off "Low Power Mode" at the top. You can also toggle off "Automatic" under that same setting if you want to keep Low Power Mode available but stop it from activating on its own at 20 percent.

Once Low Power Mode is off, your phone returns to full performance. Apps will load faster, background refresh will resume, and your screen brightness will no longer be capped.

What Low Power Mode actually does to your phone

Low Power Mode does not damage your battery or phone. Instead, it reduces the work your phone does so the charge lasts longer. It lowers screen brightness, reduces frame rates, limits background app refresh, turns off mail fetch, and slows down processor speed slightly.

These changes are temporary and reversible. Your phone returns to normal operation the moment you turn the mode off. There is no long-term harm to your device, and using Low Power Mode regularly does not wear out your battery faster — in fact, it can extend overall battery lifespan because it reduces the number of full discharge cycles.

You may notice your phone feels slower or less responsive while Low Power Mode is on. This is intentional. The trade-off is that your battery lasts significantly longer — often an extra 3 to 5 hours depending on your usage.

When Low Power Mode turns on by itself

If your battery drops to 20 percent, Low Power Mode activates automatically unless you have disabled the automatic feature. At 80 percent charge, it turns off on its own. This is the default behavior on all iPhones.

You can change this in Settings. Go to Battery, then Battery Health & Charging, and toggle off "Automatic" next to Low Power Mode. After that, Low Power Mode will only turn on if you manually enable it from Control Center.

Some users prefer to keep automatic Low Power Mode on because it extends the time between charges without requiring them to think about it. Others turn it off because they prefer full performance at all times and do not mind charging more frequently.

Checking your actual battery health

The yellow icon tells you about Low Power Mode, not about your battery's condition. To see whether your battery is actually healthy, go to Settings, tap Battery, then Battery Health & Charging. Look at the line that says "Maximum Capacity."

This percentage shows how much charge your battery can hold compared to when it was new. A new iPhone battery is at 100 percent. Over time and with normal use, this number drops — 80 percent is still considered healthy. If your maximum capacity has fallen below 80 percent and you are seeing performance issues, your battery may need service.

You can also see "Condition" on the same screen. If it says "Normal," your battery is fine. If it says "Service Recommended" or "Service Battery," contact Apple or an authorized repair shop.

Why your phone might be stuck in Low Power Mode

If Low Power Mode stays on even after you turn it off, restart your phone. Press and hold the power button and volume down together, slide to power off, wait 10 seconds, then press the power button again to turn it back on.

If it is still stuck on after a restart, go to Settings, Battery, Battery Health & Charging and toggle Low Power Mode off again. Make sure "Automatic" is also toggled off so it does not turn back on at 20 percent.

In rare cases, a software glitch can cause Low Power Mode to behave oddly. If restarting and toggling the setting do not work, update your iOS to the latest version. Go to Settings, General, Software Update and install any available update.

Frequently Asked Questions

Does Low Power Mode damage my battery?

No. Low Power Mode reduces the work your phone does, which actually helps your battery last longer over time. It does not cause wear or damage — it is a protective feature designed to extend the time between charges.

Will my phone stay slow after I turn off Low Power Mode?

No. Your phone returns to full speed when ready. Low Power Mode only affects performance while it is active. Once you turn it off, all features and performance return to normal.

Can I use my phone normally while Low Power Mode is on?

Yes, but it will be slower. You can make calls, send messages, browse the web, and use apps. The slowdown is usually noticeable but not severe. If you need full speed, turn Low Power Mode off from Control Center.

Why does my phone turn on Low Power Mode at 20 percent instead of lower?

Apple set it to 20 percent because that is the point where most users start to feel concerned about running out of charge. You can disable automatic Low Power Mode in Settings if you prefer to manage it yourself.

Is a yellow battery icon different from a red one?

Yes. Yellow means Low Power Mode is on. Red means your battery is critically low — usually below 10 percent — and you should charge soon. Red does not mean Low Power Mode is active.