How to Recalibrate the iPhone Battery (2024)

Mobile Phones

Battery life not the same on your iPhone? Recalibration may help

Jeremy Laukkonen

Writer

Shoreline Community College

Jeremy Laukkonen is automotive and tech writer for numerous major trade publications. When not researching and testing computers, game consoles or smartphones, he stays up-to-date on the myriad complex systems that power battery electric vehicles .

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Updated on September 4, 2021

Reviewed by

Jerrick Leger

Reviewed byJerrick Leger

Jerrick Leger is a CompTIA-certified IT Specialist with more than 10 years' experience in technical support and IT fields. He is also a systems administrator for an IT firm in Texas serving small businesses.

What to Know

The iPhone's calibration tool (iOS 14.5 and up) runs automatically, but you can check its status in Settings > Battery > Battery Health.
You can recalibrate older iPhones by draining the battery, fully charging it, and immediately restarting the phone.

This article explains how to recalibrate the iPhone battery using Apple’s battery recalibration tool. It also explains the old style of battery calibration.

How to Recalibrate the iPhone Battery

Apple released a battery calibration tool alongside iOS 14.5 which you can use to recalibrate your battery. If you don’t have iOS 14.5 or newer, you’ll have to update your operating system before using this tool.

If your phone is fully updated and has the battery recalibration feature, it will run automatically and help improve your battery life over time. You can check its progress at any time in the battery health section of your iPhone settings.

According to Apple, the recalibration capability for the iPhone battery is only available on iPhone 11, iPhone 11 Pro, and iPhone 11 Pro Max to address inaccurate estimates of battery health reporting for some users.

Here’s how to use the iPhone battery recalibration tool:

From the home screen, tap Settings.
In the settings menu, scroll down.
Tap Battery.
Tap Battery Health.
Look for Important Battery Message at the top of the display for information about the battery recalibration process on your phone.
See Also
Why your iPhone or iPad battery percentage jumps around
If you don’t see a message, come back and check later. The calibration process is automatic, and it can take a while.

How Does iPhone Battery Recalibration Work?

The battery calibration tool introduced with iOS 14.5 calibrates your battery automatically, so you don’t need to turn on the feature. The calibration can take weeks, and even then, it’s an ongoing process. If you don’t see a message about the status of your recalibration, check back later. As it recalibrates your battery, you will see your Maximum Capacity and Peak Performance Capability change to reflect the actual status of your battery.

How to Calibrate Other iPhone Batteries

The iPhone battery calibration tool isn’t available for all iPhones, but another iPhone calibration process has been around a lot longer. This process requires you to fully drain the battery, which can be harmful to lithium-ion batteries like the ones found in iPhones. With that in mind, you should only use this calibration process if your battery life is already low, and you should only do it occasionally. If you only calibrate your battery every few months or when your phone needs it, the benefits you see from calibration should outweigh the potential harm done by allowing the battery to die completely.

If your phone has an automatic calibration tool, do not use this process. Allow the calibration tool to do its job, even if it seems slow.

Here’s how to calibrate an older iPhone battery:

Use your phone until it shuts off due to the battery running down.
Don’t touch the phone when it shuts off. Leave it alone for at least three hours, or overnight if possible.
Plug your phone in using the original cable and charger or a cable and charger that are Apple-certified.
Wait for the phone to power on.
Turn the phone back off.
Leave your phone plugged in until it's fully charged.
Turn the phone on.
Wait for the iPhone to start up, then perform a restart.

FAQ

How do I recalibrate a laptop battery?
To recalibrate a laptop battery, right-click the Battery icon, then select Power Options and change your Windows sleep settings to remove any sleep or shutdown timers. Next, charge your battery to 100 percent and leave it plugged in as it cools down. Unplug the device to let it discharge, then recharge the battery and reset your power plan.
How do I recalibrate an Android device's battery?
To recalibrate/calibrate an Android device's battery, first, let the device discharge its battery until it powers off. Next, turn on the phone and let it turn itself off, recharge it fully, unplug it, then turn it on again and check the battery indicator to see if it's at 100 percent. After it reaches 100 percent, let the phone run down and turn itself off, then fully charge it again.
How do I recalibrate the battery on a MacBook?
To recalibrate/calibrate your MacBook's battery, if it's a newer device, let it discharge completely, then turn it off, connect it to its power cable, and fully charge the MacBook. The calibration process is automatic on older Macs, but you'll need to wait five hours to charge it again after it's been fully depleted.

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