Apple provided authorized service centers with a document informing about possible incorrect operation of iPhone 11 charging cases.
The company noted that the dedicated camera button in the Smart Battery Case may work incorrect if the client has not updated the iPhone to iOS 13.2 or later. Apple also advised technicians to remind users that one quick press of a button will not launch the Camera app to prevent inadvertent taps.
To open the program, hold down the side key. However, you can not hold it for too long, otherwise it will close. [MacRumors]