Battery for iOS 15.4.1

Hello kirill107,

With any new version of iOS there are always maintenance and re-indexing tasks to be performed. It should settle down in a few days. These are the standard steps for short battery life

1) Have you tried a restart?  If not, do it now.

2) Go to Settings > Battery > BATTERY USAGE BY APP to see the apps that are consuming your battery.

3) Check “Battery Health” in the link: 

iPhone Battery and Performance

4) If all else fails, consider a battery replacement:

iPhone Battery & Power Repair

Good luck.

As per Apple’s update it’s normal if the update was done within 48 hours. If still it continues,

You can try

1. Reset network settings once (All Wi-Fi/Bluetooth/ Connection settings will be gone and you have to reconfigure)

Settings > General > Transfer or Reset > Reset > Reset Network Settings.

Let know if it worked