JCID Battery Flex Cable iPhone 11-15Pro Max. JCID BATTERY REPAIR FLEX CABLE BUILT-IN AND EXTERNAL FPC FOR IPHONE 11-15PM. JCID full series tag-on and built-in battery repair FPC is the flex cable used for iPhone 11-15 series battery repair. It has upgraded with new functions, including free from battery boot and battery flex cable green testing. It features installation without restart, original wrapped hidden design, traceless repair and deinstallation automatic protection functions which are conductive to battery protection and safer repair.