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 occur. It's important to note, this is not a safety issue.
Apple's PR team must've carefully chosen the words in the last sentence there, as battery problems is what Samsung will work hard to shake off from its public image, thanks to the Note7.
There's no information on the number of phones affected. Apple says that only iPhone 6S units from September and October 2016 have defective batteries.
The company has made a special web page for iPhone 6S users to check if their phone is within the batch that has been affected.
It's not a design flaw. It's a manufacturing defect for a batch of phones and if you read the Apple webpage, you'd know they're offering free battery replacements for affected units.
Ahhh they released a statement semi admitting fault on the 30-11-16 almost a year after the phones were made? Guess in apple land this is lightening quick.
Guys, learn to read: It's some chemicals or components that got exposed to air "Before being assembled into battery packs". SO the fault is on the components of the batteries themselves.