Eight iPhones allegedly caught fire in China, Apple cites external damage22
Chinese users started complaining of iPhones (6 and 6s) suddenly shutting down despite having half their battery charge remaining. Apple investigated and found out that a limited batch of iPhone 6s units assembled in September and October suffered from a manufacturing fault. It began replacing units with faulty batteries worldwide. Apple also said it will update iOS with a diagnostic tool that gathers information about battery issues, which will be used to improve battery management algorithms.