iPhone 14 Plus is generating excessive heat and battery drainage after new iOS update installation.
Do any one facing heating issue and battery drainage after new iOS update
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It is normal for a phone to have increased battery load and often will run hotter than usual for up to a day or two after software upgrade or initial setup of a new device. The update process you see is only the first half of the job, and after it completes and your phone restarts you can use it again as normal. However, there are many hidden tasks in the background, cleaning up the old (now retired) software version and reindexing the file system and memory. All these things use processing power, which generates heat and uses energy from the battery.
Give it a day or two, then reboot your phone (pick the right method as below). It is likely the phone will then work as before, or even better on the new software.