December 28, 2017
A Message to Our Customers about iPhone Batteries and Performance

We’ve been hearing feedback from our customers about the way we handle 
performance for iPhones with older batteries and how we have communicated that 
process. We know that some of you feel Apple has let you down. We apologize. 
There’s been a lot of misunderstanding about this issue, so we would like to 
clarify and let you know about some changes we’re making.

First and foremost, we have never — and would never — do anything to 
intentionally shorten the life of any Apple product, or degrade the user 
experience to drive customer upgrades. Our goal has always been to create 
products that our customers love, and making iPhones last as long as possible 
is an important part of that.

How batteries age

All rechargeable batteries are consumable components that become less effective 
as they chemically age and their ability to hold a charge diminishes. Time and 
the number of times a battery has been charged are not the only factors in this 
chemical aging process.

Device use also affects the performance of a battery over its lifespan. For 
example, leaving or charging a battery in a hot environment can cause a battery 
to age faster. These are characteristics of battery chemistry, common to 
lithium-ion batteries across the industry.

A chemically aged battery also becomes less capable of delivering peak energy 
loads, especially in a low state of charge, which may result in a device 
unexpectedly shutting itself down in some situations.

To help customers learn more about iPhone’s rechargeable battery and the 
factors affecting its performance, we’ve posted a new support article, iPhone 
Battery and Performance<https://support.apple.com/HT208387>.

It should go without saying that we think sudden, unexpected shutdowns are 
unacceptable. We don’t want any of our users to lose a call, miss taking a 
picture or have any other part of their iPhone experience interrupted if we can 
avoid it.

Preventing unexpected shutdowns

About a year ago in iOS 10.2.1, we delivered a software update that improves 
power management during peak workloads to avoid unexpected shutdowns on iPhone 
6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, and iPhone SE. With the update, 
iOS dynamically manages the maximum performance of some system components when 
needed to prevent a shutdown. While these changes may go unnoticed, in some 
cases users may experience longer launch times for apps and other reductions in 
performance.

Customer response to iOS 10.2.1 was positive, as it successfully reduced the 
occurrence of unexpected shutdowns. We recently extended the same support for 
iPhone 7 and iPhone 7 Plus in iOS 11.2.

Of course, when a chemically aged battery is replaced with a new one, iPhone 
performance returns to normal when operated in standard conditions.

Recent user feedback

Over the course of this fall, we began to receive feedback from some users who 
were seeing slower performance in certain situations. Based on our experience, 
we initially thought this was due to a combination of two factors: a normal, 
temporary performance impact when upgrading the operating system as iPhone 
installs new software and updates apps, and minor bugs in the initial release 
which have since been fixed.

We now believe that another contributor to these user experiences is the 
continued chemical aging of the batteries in older iPhone 6 and iPhone 6s 
devices, many of which are still running on their original batteries.

Addressing customer concerns

We’ve always wanted our customers to be able to use their iPhones as long as 
possible. We’re proud that Apple products are known for their durability, and 
for holding their value longer than our competitors’ devices.

To address our customers’ concerns, to recognize their loyalty and to regain 
the trust of anyone who may have doubted Apple’s intentions, we’ve decided to 
take the following steps:

  *   Apple is reducing the price of an out-of-warranty iPhone battery 
replacement by $50 — from $79 to $29 — for anyone with an iPhone 6 or later 
whose battery needs to be replaced, starting in late January and available 
worldwide through December 2018. Details will be provided soon on 
apple.com<https://www.apple.com/>.
  *   Early in 2018, we will issue an iOS software update with new features 
that give users more visibility into the health of their iPhone’s battery, so 
they can see for themselves if its condition is affecting performance.
  *   As always, our team is working on ways to make the user experience even 
better, including improving how we manage performance and avoid unexpected 
shutdowns as batteries age.

At Apple, our customers’ trust means everything to us. We will never stop 
working to earn and maintain it. We are able to do the work we love only 
because of your faith and support — and we will never forget that or take it 
for granted.

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