Battery drainage after updating IOS 15.6.1

After updating the new version 15.6.1 . My iPhone se2 is not comfortable. Unusual drainage in the battery and phone becomes heat. An reminder also get on the battery option on the settings that “your iphone battery is draining more that may affect your battery life” the reason for this message is that they shown is updating the new iOS 15.6.1. So kindly fix the problem ASAP!!!