"We know that some of you feel Apple has let you down", Apple said in its posting.
The power management failsafe, which was introduced in iOS 10.2.1, is now implemented for iPhone 6, iPhone 6s and iPhone 7 devices - including Plus model variants.
Apple is already facing several class-action lawsuits in the USA and Israel after admitting to slowing older iPhones as the batteries get older. Specifically, it's a failsafe measure included in all versions of iOS released in the a year ago meant to keep components from catching fire and to prevent random shutdowns.
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However, in order to address customers' concerns, Apple announced it would be reducing the price of out-of-warranty replacement batteries for certain phones by $50, from $79 to $29. While these changes may go unnoticed, in some cases users may experience longer launch times for apps and other reductions in performance.
The lawsuits argue that by not publicly revealing this, Apple defrauded customers and may have led them to seek incorrect solutions to speed up their phones, according to Reuters which reviewed the lawsuits. And it was discovered by a user who found that replacing their iPhone's battery significantly boosted its performance.
The company's announcement said, in part, that batteries become less effective as they "chemically age" and their ability to hold a charge diminishes. And overall, analyst consensus is still for Apple to hit about $86B in revenue for the quarter, the high-end of the company's guidance.
Apple also said it will release a new iOS update that will allow users to see more about the health of their phone's battery.
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. Apple said the problem was that aging lithium batteries delivered power unevenly, which could cause iPhones to shutdown unexpectedly to protect the delicate circuits inside.