How to Check Your iPhone Battery Health—and Know When It Needs Replacement

Is your iPhone battery draining faster, charging more often, or shutting down unexpectedly? Before assuming you need a new phone, check your iPhone’s built-in Battery Health information.

App, Computer Concepts’ tech helper, has a simple rule:

“Don’t replace the whole iPhone just because the battery is getting tired. Check its health first.”

Your iPhone battery is a consumable component. It naturally loses capacity as it ages, but understanding the information in Battery Health can help you decide whether you need to change your settings, replace the battery, or have the phone professionally inspected.

How to Check Battery Health on an iPhone

The steps depend on your iPhone model.

On iPhone 14 and Earlier

Open Settings.
Tap Battery.
Tap Battery Health & Charging.

On iPhone 15 and Later

Open Settings.
Tap Battery.
Tap Battery Health.

On iPhone 15 and later, this screen may also display the battery’s cycle count, manufacture date, and first-use date. See Apple’s current Battery Health instructions.

What Does Maximum Capacity Mean?

Maximum Capacity compares your battery’s current ability to hold a charge with its capacity when it was new.

For example:

100% means the battery is operating close to its original capacity.
90% means it can hold approximately 90% of the charge it held when new.
80% means its total capacity has been reduced considerably.
Below 80% often indicates that replacement should be considered, especially if you are experiencing short battery life or performance problems.

A lower percentage does not necessarily mean your iPhone is unsafe or unusable. It means you should expect less time between charges.

Apple says iPhone 14 batteries and earlier are designed to retain 80% of their original capacity after 500 complete charge cycles under ideal conditions. Batteries in iPhone 15 models are designed to retain 80% after 1,000 complete charge cycles under ideal conditions. Actual results depend on how the phone is used and charged. Read Apple’s explanation of iPhone battery aging.

What Is an iPhone Battery Cycle?

A battery cycle is completed when you have used a total amount equal to 100% of the battery’s capacity. It does not have to happen during one charge.

For example, using 60% of the battery today and 40% tomorrow adds up to one complete charge cycle.

Cycle count is only one part of battery health. Heat exposure, charging habits, age, heavy use, and the battery’s chemical condition also affect its lifespan.

App says: “A cycle count is like mileage. It tells part of the story, but the phone’s condition and performance matter too.”

What Is Peak Performance Capability?

Battery Health may also show information about Peak Performance Capability. This indicates whether the battery can provide the instantaneous power your iPhone needs.

A chemically aged battery may still charge but struggle to deliver enough power during demanding tasks. That can lead to:

Unexpected shutdowns
Longer app-launch times
Reduced frame rates
Screen dimming
Lower speaker volume
Background apps reloading
Slower overall performance

Apple explains that iOS may apply performance management after an unexpected shutdown when the battery cannot provide the necessary peak power. Learn about iPhone performance management.

What Does “Service Recommended” Mean?

If Battery Health displays Service Recommended or says the battery’s health is significantly degraded, the battery can no longer perform as well as it once did.

You may still be able to use the phone, but you could experience:

Short battery life
Unpredictable shutdowns
Slow performance
Inconsistent charging
Excessive heat
Frequent use of Low Power Mode

A professional battery replacement may restore battery life and improve performance without requiring you to replace the entire iPhone.

Battery Health Is Not the Same as Daily Battery Usage

A healthy battery can still drain quickly if an app, background process, poor cellular signal, or screen setting uses excessive power.

Go to Settings > Battery to review which apps and system activities have used the most energy. Depending on your iOS version, you may be able to view today’s usage and activity from previous days.

Apple notes that battery usage can increase because of:

Extended screen time
Background app activity
Frequent notifications
Photo or cloud syncing
Navigation
Poor cellular coverage

Tap an app in the Battery section to see more details about its on-screen and background activity. Review Apple’s Battery Usage guide.

Signs Your iPhone Battery May Need Replacement

Consider having the battery inspected if you notice several of these symptoms:

Maximum Capacity is near or below 80%
Battery Health says Service Recommended
The iPhone shuts down unexpectedly
Battery percentage drops suddenly
The phone becomes unusually hot
Charging takes much longer than normal
The battery drains rapidly with light use
The iPhone only works reliably while connected to power
The display or case begins separating

Battery percentage alone should not make the decision. An iPhone showing 84% capacity but shutting down unexpectedly may need attention sooner than one showing 79% that still works reliably for its owner’s daily needs.

Warning: Stop Using an iPhone With a Swollen Battery

A swollen battery may push the screen away from the frame or cause the phone’s case to separate.

If you suspect swelling:

Stop charging the iPhone.
Do not press the screen back into place.
Do not bend, puncture, or remove the battery.
Keep the phone away from heat and flammable materials.
Have it professionally inspected as soon as possible.

Battery swelling is not a do-it-yourself repair.

How to Help Your iPhone Battery Last Longer

You cannot prevent normal battery aging, but good habits may help reduce unnecessary wear:

Avoid leaving the iPhone in a hot vehicle.
Keep it out of prolonged direct sunlight.
Use Optimized Battery Charging or an available charge limit.
Install current iOS updates.
Reduce unnecessary background activity.
Lower screen brightness when appropriate.
Use dependable charging cables and adapters.
Remove a case if the phone becomes excessively hot while charging.

Heat is especially hard on lithium-ion batteries. Apple advises avoiding prolonged charging or storage in hot environments.

Should You Replace the Battery or Buy a New iPhone?

Battery replacement may be worthwhile when:

The phone still meets your daily needs.
The display, cameras, and charging port work properly.
The device continues receiving suitable software support.
The replacement cost is considerably less than a new phone.
Poor battery life is the primary problem.

Replacing the entire phone may make more sense when it has several expensive problems, inadequate storage, serious liquid damage, extensive frame damage, or no longer supports the apps and features you need.

App’s opinion: “If the battery is the only tired part, give the iPhone another chance.”

Back Up Your iPhone Before Battery Service

Always create a current backup before bringing your iPhone in for diagnosis or repair. A battery replacement normally should not erase your information, but every repair carries some risk.

You can back up using iCloud or a computer. Confirm that important photographs, contacts, messages, and documents are included before service.

Computer Concepts Can Help

If your iPhone battery drains quickly, shuts down unexpectedly, overheats, displays a service warning, or has started swelling, Computer Concepts can help determine whether the problem is the battery, charging system, software, or another component.

We can assist with:

iPhone battery diagnostics
Battery-health evaluation
iPhone battery replacement options
Charging and power problems
Unexpected shutdowns
Overheating concerns
Backup guidance before repair
Advice on repairing or replacing the device

If you need professional iPhone battery help in Yorktown, Williamsburg, Newport News, or the surrounding Hampton Roads area, visit Computer Concepts.

Computer Concepts — We Fix It Right.