Apple Inc has released a statement on its Chinese website addressing the flaw that causes unexpected shutdown with its iPhone 6s and apologized to Chinese customers who had encountered this problem.

The statement, dated December 2, was released two days after China Consumers Association said on November 30 that the US tech giant needed to take further measures to address the problem. The Association further pointed out that the company had failed to “meet the basic consumer needs for normal wireless communication.” It was the second notice the group has sent to Apple in a month.

Consumers in China and the rest of the world have been complaining that their iPhones shutdown unexpectedly, even though their batteries reportedly still have 30% power remaining. 

Apple then on Friday published on its website a statement in Chinese and English, apologizing for any inconvenience this has caused customer.  “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.” The statement then offered to help with the customers who are experiencing this issue, and offered to replace batteries in affected devices, free of charge.