Copied from another thread.
Good luck getting your battery replaced easily.
My daughter's iPhone was being throttled as proven by Geekbench4 and cpudasher64. Her iPhone 6S was made in November 2015, just after the October 2015 battery recall date for the iPhone 6S. Her battery was at or slightly under 80% on my tests (yet always over on Apple's tests) and her iPhone 6S is still under Applecare warranty. She went to the Apple Store on the 27th and they refused to do anything. They were rude and said they don't look at 3rd party benchmark or CPU tests and that the battery tested fine on their test.
I told her to just buy the replacement battery and she did which immediately restored CPU speeds to normal.
When I saw the announcement Thursday (28th) I called Applecare to complain and they authorized a refund which they said had to be done at the store. When I went to the store they refused to apply the refund. I had to argue for half an hour before they actually read the Applecare Case ID and agreed.
Two rude 'geniuses' told me they were dreading all the battery replacement visits they were going to get and said the battery would still have to fail some tests before they would replace it under the new $29 terms, regardless of 3rd party CPU tests.
And the moral of this story is that a measley $79 (now $29) solves the problem.
Not to mention that a phone over 2 years old and out of warranty had a battery that was still retaining almost 80% of it’s original capacity.
And still they complain. Unbelievable.