The episode was recorded on video and released by Chinese website Sina Tech. In the images, it is possible to see the young man observing the battery and taking a bite of the component, which exploded soon after.
Luckily, the blast occurred after the boy removed the battery from his mouth. See below:
It is not possible to say exactly what went through the boy’s head when he had the brilliant idea of biting the battery – maybe he was checking if the model was really genuine – but the incident probably occurred during a component replacement process.
Since Apple admitted to slowing iPhones for the conservation of old batteries, a large number of users have been racing to change their batteries to avoid slowing down.