A yellow battery icon means Low Power Mode is on

Your iPhone's battery icon turns yellow 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 is on, your iPhone limits background activity, reduces performance slightly, and turns off some visual effects — all to preserve battery life.

Low Power Mode activates automatically when your battery drops to 20 percent, but you can also turn it on manually at any battery level. The yellow color is Apple's way of telling you the setting is active. Once you charge your phone back above 80 percent, Low Power Mode typically turns off on its own — though you can disable it sooner if you want full performance right away.

Key Takeaways

  • A yellow battery icon means Low Power Mode is turned on, which slows some phone functions to save battery life.
  • Low Power Mode activates automatically when your battery reaches 20 percent but can be turned on manually at any charge level.
  • You can turn Low Power Mode off in Settings > Battery > Battery Health & Charging, or by tapping the battery icon in Control Center.
  • Low Power Mode reduces background app refresh, mail fetch, and visual effects, which may cause some apps to load more slowly.
  • Your phone will automatically exit Low Power Mode once the battery charges above 80 percent, unless you have disabled that setting.

How to turn off Low Power Mode manually

If you want to disable Low Power Mode before your battery is fully charged, 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), then tap the battery icon. The icon will turn green when Low Power Mode is off.

You can also turn it off in the Settings app. Open Settings, tap Battery, then tap Battery Health & Charging. Toggle off the switch next to Low Power Mode. Either method works when ready — your phone will return to normal performance right away, though your battery will drain faster.

Why your phone turned on Low Power Mode automatically

If you did not manually enable Low Power Mode, your iPhone switched it on because your battery dropped to 20 percent. This is the default threshold Apple set to help you get through the day without running out of power completely. You can change when this happens, but most people leave it at 20 percent.

To adjust the automatic threshold, go to Settings > Battery > Battery Health & Charging and look for the Low Power Mode section. However, Apple does not let you set it higher than 20 percent — you can only turn off the automatic feature entirely, which means Low Power Mode will never set up unless you turn it on yourself.

What Low Power Mode actually does to your phone

Low Power Mode makes several changes to how your iPhone runs. Background app refresh pauses, so apps do not update their content when you are not using them. Mail stops fetching new messages automatically and only checks when you open the Mail app. Visual effects like animations and transitions become simpler or disappear entirely. These changes are usually not noticeable in everyday use, but some apps may take longer to load or respond.

Performance is reduced slightly — your processor does not run at full speed — but for most tasks like texting, browsing, and social media, you will not feel the difference. The trade-off is worth it: Low Power Mode can add several hours to your battery life depending on how you use your phone.

When Low Power Mode turns off automatically

Once your battery reaches 80 percent during charging, Low Power Mode turns off automatically. This happens whether you plugged in your phone or placed it on a wireless charger. You do not have to do anything — the setting disables itself.

If you prefer to keep Low Power Mode on even after your battery charges above 80 percent, you can disable the automatic shutoff. Go to Settings > Battery > Battery Health & Charging, scroll down, and toggle off "Turn Off Low Power Mode at 80%". After that, Low Power Mode will stay on until you manually turn it off, even as your battery charges to 100 percent.

Why you might want to keep Low Power Mode on

Some people leave Low Power Mode on all the time, even with a full battery. If you do not need maximum performance and want your phone to last longer between charges, keeping it on is a valid choice. This is especially useful if you are traveling, away from a charger for long periods, or straightforward want to reduce how often you need to charge.

The downside is that some features work slower — apps refresh less often, animations are reduced, and your phone's processor does not run at peak speed. For most daily tasks this does not matter, but if you play games, edit video, or use demanding apps, you may notice the slowdown. You can always turn Low Power Mode off when you need full performance and turn it back on when you do not.

Frequently Asked Questions

Does Low Power Mode damage my battery?

No. Low Power Mode does not harm your battery — it actually helps preserve battery health by reducing the strain on the battery during charging and use. Keeping your battery between 20 and 80 percent most of the time is better for long-term health than letting it drain to zero or stay at 100 percent constantly.

Can I use all my phone's features in Low Power Mode?

Most features work normally, but some are limited. Background app refresh is paused, automatic mail fetch is off, and visual effects are reduced. You can still make calls, send messages, use maps, and browse the web. If you need a specific feature that Low Power Mode affects, you can turn it off temporarily.

Why does my phone still die quickly even with Low Power Mode on?

Low Power Mode extends battery life but does not prevent it from draining if you use your phone heavily. Streaming video, using GPS, or keeping your screen at high brightness all drain the battery fast, even in Low Power Mode. If your battery drains unusually quickly, a background app or a hardware problem may be the cause — check Settings > Battery to see which apps use the most power.

Will Low Power Mode turn back on after I charge my phone?

No, not automatically. Once your battery reaches 80 percent, Low Power Mode turns off and stays off until your battery drops to 20 percent again or you manually turn it on. If you want it to stay on after charging, you must disable the automatic shutoff in Settings.