Following Apple's iPhone 6S recall program from last month, the company has outed a press release explaining the issue. The unexpected shutdown of some iPhone 6S units was caused by their batteries being exposed to "controlled ambient air" as the company puts it. We found that a small number of iPhone 6S devices made in September and October 2015 contained a battery component that was exposed to controlled ambient air longer than it should have been before being assembled into battery packs. As a result, these batteries degrade faster than a normal battery and cause unexpected shutdowns to...
Source: http://www.gsmarena.com/apple_says_defect_iphone_6s_units_had_their_batteries_exposed_to_ambient_air-news-22023.php
