Apple: unexpected iPhone 6s battery shutdowns caused by a manufacturing issue
Two weeks ago, Apple issued a global battery replacement program to address a problem where some iPhone 6s handsets manufactured between September and October 2015 may unexpectedly shut down (see if your phone is eligible for a free battery via Apple’s web tool).
While the company originally did not say why these devices are shutting down when the battery indicator drops below the 30 percent mark, MacRumors points us to a message posted in a support document on Apple’s website in China which blames the problem on a manufacturing issue.