Apple is offering to replace the batteries of a "small number" of iPhone 6S phones with a fault that makes them unexpectedly shut down. The phones with this fault were manufactured between September and October 2015, it said in a statement. From a report on BBC:Affected devices will suddenly stop working even though the handset's battery has plenty of charge. Anyone with an eligible phone who takes up the offer will get a free replacement battery for their handset. In its announcement, Apple urged customers who believe they have a faulty phone to contact an Apple store, an authorised repair shop or the firm's support line to start the process of getting a new battery. A "limited serial number range" was affected, it said.