Apple has announced an investigation into swollen batteries affecting its iPhone 8 and 8 plus, reports the Beijing Morning Post.
The American tech giant made the announcement after seven cases were reported worldwide involving swollen batteries, including two in China.
The iPhone 8 series was launched on September 22, but the new phones have failed to sell as well as Apple's previous products.
The first swollen battery was reported on September 29 by a Taiwan customer. That report suggests the new phone's battery began to swell after only five minutes of charging.
A customer in Guangzhou saw the battery of his new iPhone 8 plus, which was still in its package, swell to the point where it popped off the phone's outer shell. A young girl in Zhejiang Province also claimed on her WeChat account that her iPhone 8 started smoking during charging.
iFixit, an online community designed to help people repair things, contends the batteries on the iPhone 8 are produced by Samsung SDI. This is the same group which produced the flawed batteries for the Samsung Note 7.
This allegation has not been confirmed by Apple.
SDI is the world's largest player in the lithium battery market.
