Where to find your iPhone's battery health information

Apple stores your iPhone's battery health data in Settings, under a section called Battery. Open Settings, tap Battery, then tap Battery Health & Charging. You'll see two pieces of information: your current maximum capacity as a percentage, and the condition status (which will say "Normal" or flag a problem).

Maximum capacity tells you how much charge your battery can hold right now compared to when it was brand new. A new iPhone battery is at 100 percent capacity. After a few years of normal use, that number drops—this is expected and happens to every rechargeable battery. The condition status is Apple's assessment of whether your battery is working normally or needs service.

This screen also shows you whether your iPhone is currently using optimized battery charging, a feature that slows charging past 80 percent to reduce wear. You can turn it on or off here, though Apple recommends leaving it on.

Key Takeaways

  • Your battery health percentage is in Settings > Battery > Battery Health & Charging, and it shows how much charge your battery can hold compared to when it was new.
  • A battery at 80 percent capacity or higher is considered normal; below 80 percent means the battery is degraded but still functional.
  • Maximum capacity naturally drops over time with normal use—this is not a defect, and you do not need to replace the battery unless it falls below 80 percent or your phone shuts down unexpectedly.
  • Optimized battery charging, found on the same screen, slows charging speed to reduce wear and is on by default on most iPhones.
  • If your battery shows a condition status other than "Normal," Apple recommends service, which usually means battery replacement.

What the percentage numbers actually mean

Maximum capacity is measured as a percentage of the battery's original design capacity. If your iPhone shows 85 percent, your battery can now hold 85 percent of the charge it held when the phone was new. This is normal after one to three years of regular use.

Apple considers a battery at 80 percent capacity or higher to be in normal condition. Below 80 percent, the battery is degraded. Below 50 percent, Apple will usually recommend service. The exact threshold varies slightly by iPhone model and iOS version, but 80 percent is the standard dividing line.

Capacity drops because of chemical changes inside the battery every time you charge and discharge it. This happens to all lithium batteries and cannot be stopped, only slowed. Using optimized battery charging and keeping your phone at moderate temperatures both help slow the decline.

When battery health means you should get service

If your condition status shows anything other than "Normal"—such as "Service Recommended" or "Service Battery"—Apple is telling you the battery is not performing as it should. This does not mean your phone will stop working when ready, but it means the battery is failing faster than expected or holding less charge than it should at its age.

You should also consider service if your maximum capacity has dropped below 80 percent and your phone is shutting down unexpectedly, even when the battery percentage shows charge remaining. This is a sign the battery cannot deliver power reliably anymore.

Service usually means replacing the battery. Apple does this at Apple Stores and authorized service providers. The cost varies by iPhone model but typically ranges from $50 to $100 for out-of-warranty service. If your iPhone is still under warranty or AppleCare+, battery service may be covered.

How to slow battery degradation going forward

Optimized battery charging is the single most effective setting you can use. When it is on, your iPhone learns your charging patterns and slows charging to 80 percent until you actually need the full charge. This reduces the time the battery spends at high charge levels, which is when the most chemical wear happens. You can find this toggle in Settings > Battery > Battery Health & Charging.

Keep your iPhone at moderate temperatures. Batteries degrade faster when they are hot or very cold. Avoid leaving your phone in direct sunlight, in a hot car, or in freezing conditions for long periods. Room temperature is ideal.

Avoid letting your battery drain completely to zero regularly. Occasional full discharges are fine, but if you regularly let your phone die before charging, you are accelerating wear. Charging when the battery reaches 20 percent is gentler on the battery than waiting until it shuts down.

Reading the condition status messages

The condition status field will display one of several messages depending on your battery's state. "Normal" means your battery is working as expected for its age. "Service Recommended" means the battery is degraded enough that Apple suggests you consider replacement, though the phone will still work. "Service Battery" means the battery is failing and Apple strongly recommends service.

If you see a message about needing service, you can still use your iPhone normally while you arrange a replacement. The phone will not stop working, but the battery may not hold charge as long as it did when new, and it may drain faster under heavy use.

Occasionally, the status may show "Unknown" if the phone cannot read the battery information correctly. This is rare and usually clears after restarting your iPhone. If it persists, contact Apple Support.

What battery health does not tell you

Battery health percentage is not the same as how long your phone will last on a single charge. A phone at 85 percent capacity might still last all day if you use it lightly, or it might need charging by afternoon if you use it heavily. The percentage tells you the battery's condition, not your usage pattern.

Battery health also does not predict when your battery will fail completely. A battery at 70 percent capacity may work reliably for another year, or it may start showing problems sooner. The percentage is a snapshot of current condition, not a forecast.

Finally, battery health is specific to your device. You cannot compare your iPhone's battery health to someone else's and draw conclusions about whose phone is "better." Two iPhones of the same model and age will have different battery health depending on how they were charged, stored, and used.

Frequently Asked Questions

Is 80 percent battery health bad?

No. Eighty percent is Apple's threshold for normal condition, so a battery at exactly 80 percent is still considered healthy. Batteries naturally degrade over time with use, and reaching 80 percent after two to three years is typical. You do not need to replace it unless the condition status says otherwise or your phone shuts down unexpectedly.

Can I improve my battery health percentage?

No. Once a battery's capacity drops, it cannot be restored by software, settings, or charging habits. You can only slow future degradation by using optimized battery charging, keeping your phone cool, and avoiding complete discharges. If your capacity is already low, the only way to restore it is to replace the battery.

Why does my battery health drop so fast?

Fast degradation usually comes from heat, frequent full discharges, or heavy use. If your phone gets hot regularly—from gaming, video recording, or sitting in the sun—the battery wears faster. Turning on optimized battery charging and keeping your phone at moderate temperatures will slow the decline. If degradation is extreme for your phone's age, contact Apple Support.

Do I need to replace my battery if it is at 85 percent?

No. Eighty-five percent is well within normal range and does not require service. Most people replace their iPhone battery when it drops below 80 percent and they notice the phone drains quickly, or when the condition status changes to "Service Recommended." You can wait until either of those happens.

Will checking battery health drain my battery?

No. Opening Settings and viewing your battery health uses negligible power and will not affect your battery or its health. You can check it as often as you want without any negative effect.