http://www.techradar.com/news/a-few-users-reporting-swollen-iphone-8-plus-batteries

The last thing you want when you buy a new smartphone is it developing a fault, especially anything involving the battery, but that’s what a handful of users are reporting has happened with their new iPhone 8 Plus units.

One of the earliest reports came over a week ago, with Twitter user @Magokoro0511 claiming that when they first opened the box the battery was already inflated, pushing the display away from the frame.