Apple did not specify the exact number of affected devices, saying that only a very limited number has been plagued.
“We recently discovered a manufacturing issue affecting a very limited number of iPhone 5S devices that could cause the battery to take longer to charge or result in reduced battery life,” an Apple rep told The New York Times this week.
“We are reaching out to customers with affected phones and will provide them with a replacement phone.”
So AppleCare will contact all users who have such devices.
Users will be required users to send the iPhones back or visit an Apple Store for replacement.