Apple's iPhone 6S battery issue is larger than the company first thought.
The problem: iPhone 6S devices that shut down the phones abruptly. After announcing an exchange program last month for certain phones, Apple said Tuesday that the issue may extend beyond phones manufactured in September or October of 2015.
"A small number of customers outside of the affected range have also reported an unexpected shutdown," wrote the iPhone maker in a posting on the company's Chinese support page. Apple notes that some phones shut down "under normal conditions in order for the iPhone to protect its electronics," but that it would be releasing a software update next week to garner more information. It is also exploring a possible software fix which would be deployed in a future version of iOS.
Apple declined to comment on how many phones are impacted or if the issue extended to other devices such as the iPhone 6S Plus.
The problem stems from a component in the battery that was "exposed to controlled ambient air" for a longer period of time than it should have been before it was put into the battery packs.