As it turns out Apple has recently changed the battery replacement policy on iPhone 6 or newer devices and will accept all requests, no matter what the internal diagnostic tool says.
The French iGen website reports that Apple has published an internal memo to inform Apple Store employees and Apple's authorized stores that battery replacement is due to all company customers even if the diagnostic tool used shows that the battery is in good condition.
At the end of last week, Apple issued a statement on the iPhone battery fuse, reducing the replacement battery price of devices starting from iPhone 6 to 29 USD. This battery replacement program started in December of 2017 and will be valid until December of 2018.
Apple's previous battery replacement policy indicated that to approve a request, a diagnosis should be made to show that the battery was actually downgraded, otherwise the company could refuse replacement.
This is no longer the case, and all those who have old appliances iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone 7 ή 7 iPhone Plus they can change their batteries for 29 dollars.
However, many are still convinced that Apple will have to replace the batteries completely free of charge, considering how much an iPhone costs.
In addition to the iPhone battery replacement program, Apple has promised to apply new features to an upcoming iOS version that will help customers see battery status, how it affects the overall performance of the device and whether it needs to be replaced or not.