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 built-in feature that reduces power consumption to extend how long your phone lasts on a single charge. When Low Power Mode turns on, iOS limits background activity, reduces performance slightly, and dims some features — all to stretch your battery life further.

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 Apple's way of telling you the phone is running in this reduced-power state. It is not a warning that something is wrong — it is a deliberate choice your phone made, or that you made yourself.

Key Takeaways

  • A yellow battery icon means Low Power Mode is active, which slows some phone functions to save power.
  • Low Power Mode turns on automatically when your battery reaches 20 percent, but you can also turn it on manually whenever you want.
  • You can disable Low Power Mode in Settings under Battery, or by tapping the battery percentage icon in Control Center.
  • Turning off Low Power Mode restores full performance but will drain your battery faster.
  • The yellow icon disappears as soon as Low Power Mode is off, even if your battery is still low.

How Low Power Mode affects your phone's performance

When Low Power Mode is on, your iPhone makes several changes to use less energy. Background app refresh slows down, meaning apps do not check for new messages or updates as often. Mail fetches less frequently, and some visual effects like animations are reduced or turned off. Your phone may also run at a slightly lower processor speed, which can make apps open a bit slower or games run less smoothly.

These changes are usually not noticeable during everyday use — texting, calling, and browsing still work normally. The trade-off is that your battery lasts significantly longer. On most iPhones, Low Power Mode can add several extra hours of use before you need to charge.

How to turn Low Power Mode on and off

You have two quick ways to control Low Power Mode. The fastest is to open Control Center by swiping down from the top-right corner of your screen (or up from the bottom on older models), then tap the battery icon. It will turn yellow when Low Power Mode is on, and white or green when it is off.

The second way is through Settings. Open Settings, tap Battery, then tap Battery Saver. Toggle the switch on to enable Low Power Mode, or off to disable it. Both methods work when ready — your phone does not need to restart.

Why your phone turned on Low Power Mode automatically

By default, Low Power Mode activates automatically when your battery level drops to 20 percent. This happens without any action from you — your phone straightforward switches into power-saving mode to keep you from running out of charge unexpectedly. You will see the yellow battery icon appear at that moment.

If you do not want Low Power Mode to turn on automatically, you can disable this feature in Settings. Open Settings, go to Battery, then tap Battery Saver. Toggle off the switch next to "Enable Low Power Mode at 20%". After that, Low Power Mode will only turn on if you manually enable it.

When to leave Low Power Mode on or turn it off

Leave Low Power Mode on if you are away from a charger for most of the day and want your battery to last as long as possible. The performance impact is minimal for most tasks, and the extra battery life is worth the trade-off. If you are using your phone for demanding tasks like gaming, video editing, or heavy multitasking, turning Low Power Mode off will give you better performance.

You should also turn Low Power Mode off when you are near a charger or have just plugged in. There is no reason to limit performance when your battery is charging or fully charged. Once you unplug and your battery drops again, you can turn Low Power Mode back on if needed.

Other battery icon colors and what they mean

Your iPhone battery icon can appear in different colors depending on your charge level and settings. A green battery icon means your phone is charging or has recently been charged. A red battery icon means your battery is critically low — usually below 5 or 10 percent — and your phone may shut down soon if you do not charge it. The icon turns red to warn you that you are running out of time.

A white battery icon appears when your phone is not in Low Power Mode and has a normal charge level. The color changes are automatic and reflect your phone's current power state. If you see red, find a charger when ready. If you see yellow, Low Power Mode is on and working to extend your battery life.

Frequently Asked Questions

Does Low Power Mode damage my battery?

No. Low Power Mode does not harm your battery. It straightforward reduces the rate at which your phone uses power. Using Low Power Mode regularly is safe and does not shorten your battery's lifespan. In fact, keeping your battery from draining completely can help it last longer overall.

Will my apps work normally in Low Power Mode?

Most apps work normally in Low Power Mode. Messaging, calling, email, and web browsing are unaffected. Some apps may update less frequently in the background, and games or video apps may have slightly reduced graphics. You will not notice a difference in most everyday tasks.

Can I turn off the yellow battery icon without turning off Low Power Mode?

No. The yellow icon is tied directly to Low Power Mode. If you want the icon to disappear, you must turn off Low Power Mode. Once you do, the icon will change to white or green depending on your charge level.

Why does my phone keep turning on Low Power Mode at 20 percent?

This is the default behavior. Your iPhone is set to automatically enable Low Power Mode when your battery reaches 20 percent. If you do not want this to happen, go to Settings, tap Battery, then Battery Saver, and toggle off the automatic set up switch.

Does Low Power Mode work on all iPhone models?

Low Power Mode is available on iPhone 6 and newer. If you have an older iPhone, this feature is not available. On newer models, it works the same way across all versions.