After listening to customer feedback Apple have decided to reduce the cost of out of warranty batteries by £54 - from £79 to £25 - for anyone with an iPhone 6 or later whose battery needs to be replaced, available until December 2018. Details will be provided soon on apple.com/uk.
In early 2018 Apple will issue an iOS software update with new features that gives users more visibility into the health of their iPhone's battery so users can see for themselves if its condition is affecting performance.
Its worth mentioning that some battery components can 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 ageing 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 Apple have posted a new support article, iPhone Battery and Performance.