Where to find your battery percentage on the home screen

The fastest way to see how much charge your iPhone has left is to look at the battery icon in the top-right corner of your screen. On newer iPhones without a notch, this icon appears in the status bar at the very top. The icon fills with color as your battery drains — a full green icon means 100%, and as it empties, the color fades and the icon shrinks.

If you want a number instead of just the icon, you can turn on the battery percentage display. Swipe down from the top-right corner to open Control Center, then look for the battery icon with a percentage next to it. On older iPhones with a home button, swipe up from the bottom instead. This shows you the exact percentage at a glance whenever you open Control Center.

To make the percentage always visible in your status bar, go to Settings > Battery > Battery Percentage and toggle it on. Now the number will appear next to the battery icon at all times, even when you are not in Control Center.

Key Takeaways

  • Your battery percentage appears in the top-right corner of your screen, and you can turn on a number display in Settings > Battery > Battery Percentage.
  • Battery Health shows how much capacity your battery retains compared to when it was new, found in Settings > Battery > Battery Health & Charging.
  • Normal battery health is 80% or higher; anything below 80% means your battery is aging and may need replacement eventually.
  • Your iPhone will show a Low Power Mode warning when battery drops to 20%, and you can turn on Optimized Battery Charging to slow aging.

Checking your battery health in Settings

Battery percentage tells you how much charge you have right now, but battery health tells you whether your battery is still working well. A battery degrades over time — after hundreds of charge cycles, it holds less power than it did when new. To see how much capacity your battery has lost, go to Settings > Battery > Battery Health & Charging.

You will see a number labeled Maximum Capacity. This percentage shows how much charge your battery can hold compared to when it left the factory. A new iPhone battery is at 100%. After a year or two of normal use, it might be at 90% or 95%. If it drops to 80% or lower, Apple considers the battery significantly degraded.

Below Maximum Capacity, you may also see Peak Performance Capability. This tells you whether your iPhone is running at full speed or if the system has slowed it down to protect an aging battery. If it says your phone is operating at peak performance, your battery is healthy enough that no slowdown is needed.

Understanding Low Power Mode and when it activates

When your battery drops to 20%, your iPhone will suggest turning on Low Power Mode. This feature reduces background activity, dims the screen slightly, and limits performance to stretch your remaining charge. You can turn it on manually anytime by going to Settings > Battery > Low Power Mode, or by tapping the battery icon in Control Center.

At 10% battery, Low Power Mode turns on automatically whether you want it or not. Your iPhone will also warn you that the battery is critically low. At 0%, your phone shuts down completely and will not turn back on until you plug it in.

Low Power Mode does not harm your battery — it is a temporary setting that turns off when you charge back above 80%. Using it regularly can actually help your battery last longer by reducing the number of full discharge cycles.

Turning on Optimized Battery Charging to slow battery aging

If you want your battery to age more slowly, turn on Optimized Battery Charging in Settings > Battery > Battery Health & Charging. When this is on, your iPhone learns when you usually charge it and slows down charging to 80% until you are about to use the phone. This keeps your battery from sitting at 100% for long periods, which speeds up aging.

For example, if you plug in your phone at night and usually wake up at 7 a.m., Optimized Battery Charging will charge to 80% by midnight, then wait until 6:45 a.m. to finish charging to 100%. This small change adds up over months and can keep your battery health higher for longer.

You can turn this off anytime if you need a full charge right away — your iPhone will ask you to confirm before skipping the optimization for that charge cycle.

What battery health numbers mean for your phone

Battery health between 100% and 80% is normal and expected. Your phone will work at full speed and hold a full day of charge without problems. You do not need to do anything at this stage except continue normal use.

Battery health between 80% and 70% means your battery is aging noticeably but still functional. You may notice your phone does not last quite as long on a single charge, especially if you use it heavily. Your iPhone will still run at full performance. Many people keep using their phones at this stage for another year or more.

Battery health below 70% means your battery is significantly degraded. Your phone may shut down unexpectedly even when the battery percentage shows 20% or higher, because the battery cannot deliver the power the phone needs. At this point, Apple recommends having the battery replaced. You can do this at an Apple Store or through an authorized repair shop.

Checking battery usage by app

If your battery is draining faster than it should, you can see which apps are using the most power. Go to Settings > Battery > Battery Usage. This shows a list of apps ranked by how much battery they have used in the last 24 hours or the last 10 days — tap the time period at the top to switch between them.

Apps that use a lot of battery are not necessarily a problem — a navigation app or video player will naturally use more power than a text app. But if you see an app using an unusual amount of battery, or if an app you rarely use is high on the list, that app may have a problem. Try closing it, restarting your phone, or uninstalling and reinstalling it.

You can also see battery usage by activity type — tap Show Activities to see whether your battery is being used by the screen, background activity, or something else. If the screen is using most of your battery, try lowering your brightness or enabling Dark Mode.

Frequently Asked Questions

Is 85% battery health bad?

No. Battery health between 80% and 100% is normal and healthy. Your phone will work at full speed and hold a full charge. Most people do not need to think about battery replacement until health drops below 70%.

Why is my battery health dropping so fast?

Fast battery aging usually comes from frequent full discharge cycles, charging in hot conditions, or leaving your phone plugged in at 100% for long periods. Try turning on Optimized Battery Charging, avoid letting the battery drop to 0%, and keep your phone cool while charging. If health is still dropping unusually fast after a few weeks, your battery may be defective.

Can I replace my iPhone battery myself?

Apple does not recommend it, and opening your phone yourself will void your warranty. Take your phone to an Apple Store or an authorized repair shop. Replacement usually takes a few hours and costs between $50 and $100 depending on your model.

Does Low Power Mode damage my battery?

No. Low Power Mode is a temporary setting that reduces performance to save charge. It does not harm your battery and actually helps it last longer by reducing full discharge cycles. You can use it as often as you want.

What does "peak performance capability" mean?

It means your iPhone is running at full speed. If your battery health is high enough, your phone does not need to slow itself down. If peak performance is unavailable, your phone has slowed itself to protect an aging battery from unexpected shutdowns.