San Francisco:
Apple apologised to its customers on Friday for slowing down performance of older iPhone models and said it would discount replacement batteries for some of its handsets.
The move by Apple responded to an uproar from iPhone users and a series of lawsuits, after news of the battery problems stoked concerns the company was unfairly nudging consumers to upgrade.
"We know that some of you feel Apple has let you down. We apologise," Apple said in a message to customers on its website.
"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."
Apple said it was reducing the price of an out-of- warranty iPhone battery replacement from USD 79 to USD 29 for anyone with an iPhone 6 or later whose battery needs to be replaced, starting in late January through December 2018.
The company said it also would issue a software update to make it easier for customers to see if an ageing battery 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," the statement said.
The controversy erupted last week after Apple acknowledged a feature to "smooth out" spikes in demand for power to prevent iPhone 6 models from shutting down due to the cold or weak batteries.
Rumours had persisted for years at tech news websites devoted to Apple products and among fans of the company's products that iPhone performance was being intentionally slowed, perhaps to push users to buy newer models.
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Apple's latest statement said that "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."
But it noted that "batteries are consumable components that become less effective as they chemically age" and that factors such as heat can affect performance.
Apple said a software update last year "manages the maximum performance of some system components when needed to prevent a shutdown" and that "in some cases users may experience longer launch times for apps and other reductions in performance."
