How to Check Your iPhone Battery Health with iOS 11.3

We all know that Apple released the iOS 11.3 in March and brought a new function Battery Health to us. Through this new function, we can know the details of the battery health. Here I will show you how to check the iPhone battery health and disable the performance management.


1. How to check the iPhone battery capacity

Go to Setting>Battery>Battery Health (Beta), we can see the percent of the battery capacity. When the phone was first activated, the maximum capacity is 100%.

iOS battery health

iOS battery health 100%

2. Should I replace a new battery for iPhone

As we all know, with the time going, the lithium-ion battery will become less effective and the maximum capacity will reduce. In the normal conditions, a battery will retain up to 80% of its original capacity after 500 complete charge cycles.

If your phone battery capacity is between 80%-100%, the battery can support normal peak performance and the device works normally.

iPhone battery health normal

If your iPhone battery capacity is under 80%, you will get an information “Your battery’s health is significantly degraded. An Apple Authorized Service Provider can replace the battery to restore full performance and capacity. More about service options…” In this case, you should replace a new battery for your device in the Apple Authorized Service Provider.

iOS 11.3 notice should replace a new battery

3. How to enable and disable performance management feature

When you update the device system to iOS 11.3, the performance management is initially disabled. It will be re-enabled after the device experiencing an unexpected shutdown.

If you want to disable the performance management, tap the disable under the Peak Performance Capability.

disable performance magement

Once you close this function, it can’t turn on until the phone shutdown unexpected.

4. Why do I can’t see the battery health information

If you can’t see the health of the iPhone battery and it shows this message” This iPhone is unable to determine battery health”. This means that the device was installed an improper battery or an unknown battery. All ETrade Supply iPhone batteries delivered from HK after 2018.04.24 are compatible with the iOS 11.3. (Notes: The batteries we shipped in the previous time can work fine with the iPhone but they can't be recognized by the iOS 11.3.)

iPhone battery can't be determined

If you want to know other topics about iPhone repair, welcome to comment below.

If you are interested in iPhone repair and want to write for us, please feel free to contact

You may also like:

How to Fix iPhone Battery Drains Fast with iOS 11.4

why iPhone battery is becoming shorter

15 Ways to Extend Your iPhone Battery Life

How to Solve iOS 7.1 Battery Problems After Update


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