disabling a new functionality to enhance battery efficiency. Nevertheless, Apple claims that it is perfectly normal for users to experience a reduction in their iPhone’s battery performance following an update to the most recent iOS version. As per Apple, even once the download has finished and users can resume using their device, the setup procedure for the new iOS continues to operate in the background.
Apple asserts that the impact on battery performance post-software update is temporary. The company indicates that this stage may also influence a device’s “thermal performance.” In essence, it could be typical for your phone to become warmer rather easily after you have applied the latest update.