Apple released a statement to The New York Times on Tuesday night noting that a manufacturing issue has caused shortened battery life in a ‘very limited’ number of iPhone 5s devices. At its introduction, the phone was reported by Apple to have nearly identical life to the iPhone 5, and most tests have borne that out with reviewers seeing identical or slightly improved numbers. The statement, issued by an Apple spokesperson, indicates that a small number of the iPhones that Apple has sold so far are defective. Here’s the statement given to the Times: “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,” said Teresa Brewer, an Apple spokeswoman. “We are reaching out to customers with affected phones and will provide them with a replacement phone.”