iPhone 8 Plus Batteries Are Swelling Out of Their Cases: Reports

iphone 8 plus battery expanding
Apple's new iPhone 8 (right) and 8 Plus at the Apple Store in Tokyo's Omotesando shopping district. Issei Kato/ REUTERS

Another iPhone 8 Plus battery has swelled out of its case, reports state media in China, the world's biggest smartphone market where the U.S. firm is seeking to revive faltering sales.

The incident comes as Apple investigates similar cases reported in Taiwan and Japan of batteries in its latest iPhone 8 Plus becoming bloated, causing the device's casing to open.

On its website on Thursday, China's state-backed ThePaper.cn cited an iPhone buyer surnamed Liu as saying his newly purchased iPhone 8 Plus arrived cracked open on October 5. There was no sign of scorching or an explosion.

Read more: Has the world reached peak iPhone?

Liu told ThePaper he bought the handset through online marketplace of JD.com. He said he did not charge the new device and returned it to the seller.

Images of the iPhone 8 which a state-run Chinese website says burst open due to a swollen battery — one of growing no. of similar reports pic.twitter.com/nTQNGooY2i

— David Gilbert (@daithaigilbert) October 6, 2017

Pictures taken by Liu and displayed on ThePaper's website showed an iPhone 8 Plus split open along the side featuring the SIM card holding, with the phone's internal parts visible.

An Apple spokesperson said the company is looking into the matter and declined to comment further.

The incident comes as indifferent reviews of the iPhone 8, which comes 10 years after Apple released the first version of the revolutionary phone, drove down shares of the company since the handset's launch.

Some investors worry whether preorders for the device were well below previous launches, although some Apple fans are waiting for the premium iPhone X, due out in early November.

apple iphone 8 plus battery exploding
Apple launched the iPhone 8 and 8 Plus at the GUM department store in Moscow on September 29. Sefa Karacan/Anadolu Agency/Getty Images

Apple competes in China with local makers such as Huawei and Oppo, which sell phones with high-end features at lower prices.

The reports come in the same week that Google launched the Pixel 2 and Pixel 2 XL smartphones, which the company hopes will rival the iPhone 8 and iPhone 8 Plus at the premium end of the smartphone market.