That article is full of errors.
The picture shows an IPhone X rather than an iPhone 8.
It says the battery is the same as the one used in the Samsung Note 7, which then goes on to say that the Note 7's battery has no known issues. The Note 7 was recalled and then discontinued because of batteries exploding.
It seems very few can make a safe Lithium battery these days. Not at all surprising really. From school physics, I remember that Lithium wasn't exactly a stable element.