iPhone Battery Risk Warning 

Apple has issued a warning to iPhone users about the dangers of practices like charging a phone under a blanket or pillow at night, risking overheating and posing a fire risk. 

Danger From Prolonged Heat Exposure 

In a wide ranging post on the iPhone user-guide section of Apple’s website, the company warns about the dangers of “prolonged heat exposure” in relation to skin contact with an iPhone, its adapter, or wireless charger. For example, Apple says that “sustained contact with warm surfaces for long periods of time may cause discomfort or injury” and ask users to “use common sense to avoid situations where your skin is in contact with a device, its power adapter, or a wireless charger when it’s operating or connected to a power source for long periods of time”.