Where to find your iPhone battery information

Your iPhone stores battery health data in Settings under Battery. Open Settings, tap Battery, then tap Battery Health & Charging. This screen shows two numbers: your battery's maximum capacity as a percentage of its original design, and its peak performance capability. Maximum capacity tells you how much charge your battery can hold compared to when it was new. Peak performance capability tells you whether your phone can still deliver full power or if it has slowed itself down to protect the battery.

The same Settings > Battery menu also shows Battery Usage, which breaks down which apps have consumed power since your last full charge or in the last 24 hours. You can toggle between these two views to see recent drain or longer patterns.

Key Takeaways

  • Battery Health & Charging is in Settings > Battery and shows your maximum capacity percentage and whether your phone is running at full performance.
  • Maximum capacity below 80 percent usually means the battery is aging and may need replacement within the next year or two.
  • Battery Usage in the same menu shows which apps are draining power most, measured in percentage of total use since your last full charge.
  • iOS automatically slows your phone if the battery cannot deliver peak power, a feature you can turn off manually if you accept shorter battery life between charges.

What maximum capacity percentage means

Maximum capacity is the amount of charge your battery can hold right now, expressed as a percentage of its original capacity when the phone was new. A new iPhone shows 100 percent. After a year of normal use, most iPhones drop to 95 to 98 percent. After two years, 85 to 90 percent is typical. After three years, 75 to 85 percent is common.

Apple considers a battery degraded when it falls below 80 percent maximum capacity. At that point, you may notice your phone dies faster during heavy use, even though it still charges to 100 percent. The battery is not broken — it straightforward holds less total energy. Replacement is not urgent unless you are running out of power during your day.

Maximum capacity does not tell you how fast your battery drains right now. A battery at 85 percent capacity drains at the same rate per hour as a new battery; it just runs out sooner. If your phone is dying quickly, check Battery Usage instead.

Reading battery usage by app

Battery Usage shows you which apps consumed the most power. Open Settings > Battery, then tap Battery Usage. You will see a list of apps with a percentage next to each one. The percentage is that app's share of total battery drain since your last full charge, or in the last 24 hours if you toggle to that view.

An app using 30 percent of your battery drain does not mean it used 30 percent of your phone's power in absolute terms — it means it used 30 percent of whatever power was consumed by all apps combined. If your phone drained 50 percent in one hour, that app used roughly 15 percent of your battery. If your phone drained 10 percent in eight hours, that app used roughly 3 percent.

Apps that run in the background, play video, or use location drain the most. Maps, YouTube, TikTok, and Spotify typically appear high on the list. If an app you rarely use is draining significant power, it may have a background refresh setting you can turn off in Settings > General > Background App Refresh.

Understanding peak performance capability

Peak performance capability tells you whether your iPhone can run at full speed or whether iOS has slowed it down to protect an aging battery. A battery that cannot deliver enough power to the processor causes unexpected shutdowns, so iOS throttles performance — reduces speed — to prevent that.

If your battery health shows "Peak performance capability: This iPhone is operating at normal performance," your phone is running at full speed. If it says your phone has experienced unexpected shutdowns and is now running at reduced performance, iOS has throttled your processor. You can turn off throttling in the same menu, but doing so risks sudden shutdowns if your battery cannot keep up with demand.

Throttling is temporary. If you replace the battery, iOS will resume full performance automatically. You do not need to change any settings.

Checking battery drain over different time periods

Battery Usage offers two views: Last 24 Hours and Last 10 Days. Last 24 Hours shows which apps drained power most recently and is useful for spotting a sudden drain caused by a specific app or activity. Last 10 Days shows the average drain pattern over a longer period and helps you see whether a particular app consistently drains more than others.

If an app appears high on the Last 24 Hours list but low on the Last 10 Days list, it drained power only recently — perhaps because you used it heavily today or it was syncing data. If an app appears high on both lists, it consistently drains power and may be worth investigating.

You can also check Low Power Mode in Settings > Battery. This mode reduces performance, limits background activity, and disables some features like mail fetch and visual effects. Turning it on extends battery life by 15 to 20 percent on most phones, though at the cost of slower performance.

When to consider battery replacement

Apple recommends battery replacement when maximum capacity drops below 80 percent, though you do not have to replace it when ready. If your phone still lasts a full day with normal use, you can wait. If you are charging multiple times a day or your phone shuts down unexpectedly, replacement becomes more practical.

Battery replacement costs vary by iPhone model. Older models (iPhone 6 through iPhone X) cost less to replace than newer ones (iPhone 11 and later). Apple offers the service at Apple Stores and authorized repair shops. Third-party repair shops often charge less but may use non-original batteries, which can affect performance and longevity.

If your iPhone is still under warranty or covered by AppleCare+, battery replacement may be free if the battery capacity has dropped below 80 percent due to a manufacturing defect rather than normal wear.

Frequently Asked Questions

Why is my battery health dropping so fast?

Fast battery degradation is usually caused by heat exposure, frequent full discharge cycles, or constant high-power use. Avoid leaving your phone in hot cars, charge it before it drops to zero, and close apps running in the background. If your battery dropped 10 percent in a few weeks, that is unusual and may indicate a defect — contact Apple to discuss replacement options.

Does low power mode damage my battery?

No. Low Power Mode reduces performance and background activity but does not harm the battery. You can use it whenever you want. It actually reduces battery stress by lowering power demand, so using it regularly may slow degradation slightly.

Can I replace just the battery without replacing the whole phone?

Yes. Apple and authorized repair shops replace batteries separately. The process takes one to three hours at an Apple Store, or longer at some third-party shops. You keep your phone and all your data. Costs range from $50 to $100 depending on your model.

What does "service battery soon" mean?

This message appears when your battery health has dropped significantly and Apple's systems have detected it. It means your battery should be replaced soon, though your phone will still work. Schedule a replacement at an Apple Store or authorized repair shop within the next week or two.

Is it normal for battery health to drop 1 percent per month?

Yes. Most iPhones lose 1 to 2 percent of maximum capacity per month during the first year, then slower after that. If you are losing more than 2 percent per month consistently, your battery may be defective or you may be exposing it to heat or deep discharge cycles regularly.