Low Battery Mode slows down your iPhone to use less power
Low Battery Mode is a setting that reduces how hard your iPhone works so the battery lasts longer. When you turn it on, your phone limits background activity, reduces performance, and turns off some features you don't need right away. The goal is to stretch battery life when you're away from a charger and don't want your phone to die.
Your iPhone will suggest turning on Low Battery Mode when the battery reaches 20 percent. You can also turn it on manually at any charge level — some people turn it on at 30 or 40 percent if they know they won't see a charger for hours. The mode stays on until you charge to 80 percent, then turns off automatically.
Key Takeaways
- Low Battery Mode reduces performance and background activity to make your battery last longer when you're running low.
- Your iPhone suggests Low Battery Mode at 20 percent charge, but you can turn it on earlier if you know you'll be away from a charger.
- The mode automatically turns off when you charge your phone to 80 percent.
- Some features like mail fetching, app refresh, and automatic downloads pause while Low Battery Mode is on.
- You can turn Low Battery Mode on or off anytime in Settings > Battery, or from Control Center.
What actually changes when Low Battery Mode is on
When Low Battery Mode is active, your iPhone makes several changes at once. Background app refresh pauses — apps stop checking for new messages or updates when you're not using them. Mail stops fetching new messages automatically and only checks when you open the Mail app. Automatic downloads of apps and updates stop until you plug in.
Your phone also reduces performance. Apps open a bit slower, animations are less smooth, and downloads and uploads run at a slower speed. The display brightness may dim slightly. These changes are usually noticeable only if you're doing something demanding like gaming or video editing — everyday tasks like texting and web browsing feel mostly normal.
Features that use a lot of power, like location services and 5G, continue to work but may be used less aggressively by apps. Some visual effects in the interface are simplified. Siri still works, but may take slightly longer to respond.
How to turn Low Battery Mode on and 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. It will turn yellow when Low Battery Mode is on.
You can also go to Settings > Battery, then toggle Low Battery Mode on or off. This route shows you your current battery percentage and lets you see which apps have used the most power today.
When you charge your phone to 80 percent, Low Battery Mode turns off automatically. If you want it to stay on even after charging past 80 percent, you'll need to turn it back on manually — it doesn't have a "keep it on" option.
When Low Battery Mode actually helps
Low Battery Mode is most useful when you're traveling, at work without access to a charger, or in a situation where you need your phone to last until evening. If you turn it on at 30 percent instead of waiting until 20 percent, you can often add two to four hours of battery life, depending on how much you use your phone.
It's less useful if you're sitting at home or in an office where you can charge anytime. If you use your phone heavily — lots of video calls, gaming, or navigation — Low Battery Mode helps but won't make a dramatic difference. The real payoff comes from using it before you're in a panic about battery life.
Some people leave Low Battery Mode on all the time to extend battery lifespan over months and years. This is safe and won't damage your phone, though you'll notice the slower performance every day.
What Low Battery Mode does not do
Low Battery Mode does not close apps or delete data. Your photos, messages, and files stay exactly where they are. It doesn't prevent you from using your phone — you can still make calls, send texts, browse the web, and use any app you want. It just makes those things happen a bit slower.
It also doesn't turn off your cellular connection or Wi-Fi, so you can still receive calls and messages. Location services stay on unless you turn them off separately in Settings > Privacy > Location Services.
Why your iPhone suggests Low Battery Mode at 20 percent
Apple chose 20 percent as the threshold because that's roughly when most people are a few hours away from a charger. At that point, turning on Low Battery Mode can often double the remaining battery life. Below 20 percent, your phone is already in a precarious state, so the suggestion appears as a reminder.
You don't have to wait for the suggestion. If you know you're going to be away from power for a long time, turning on Low Battery Mode at 40 or 50 percent is a smart move. The earlier you turn it on, the more battery life you preserve.
Frequently Asked Questions
Does Low Battery Mode damage my iPhone battery?
No. Low Battery Mode is designed to reduce strain on your battery by limiting power-hungry tasks. Using it regularly is safe and may even help your battery stay healthier over time by reducing the number of full discharge cycles.
Will I miss notifications if Low Battery Mode is on?
You'll still get notifications for calls, texts, and most apps. Background app refresh is paused, so some apps may not update their content until you open them, but you won't miss urgent messages.
Can I use Low Battery Mode while charging?
Yes. Low Battery Mode will stay on while you charge and will turn off automatically when you reach 80 percent. You can also manually turn it off anytime, even while plugged in.
What's the difference between Low Battery Mode and turning off Wi-Fi or Bluetooth?
Low Battery Mode affects many systems at once — performance, background refresh, animations, and more. Turning off Wi-Fi or Bluetooth saves power from just those radios. Low Battery Mode is more comprehensive but also affects how your phone feels to use.