iPhone: error message after battery change

So how can this phenomenon be explained?

It is important to note that all batteries have a serial number and what is known as a "microcontroller" that provides certain information about them, such as their capacity, temperature, etc. The microcontrollers in Apple batteries have an additional authentication function. If a battery other than the one designed for the device is connected to the phone, the motherboard will detect it and automatically display an error message. Only Apple technicians can remove the message after a battery replacement.

It should be noted that serial numbers for authenticating the original battery have been in use since the iPhone XS series. All previous models are therefore not affected by this issue.

So don't worry if you replace your battery! Even if it is an Apple battery, the message will still appear.

Apple. seems to be taking extra precautions to protect itself in the event of an incident after a part has been replaced by an unauthorised repairer or by the phone owner themselves. But as they themselves point out, this has no impact on the use of the device. You will simply no longer have access to the information provided by the microcontroller, such as battery capacity and temperature.