ios 15.4.1

Thank you for your reply!

It is assumed that an update has solved the battery drain problem. If you are still facing this problem, you should Contact Apple for support and service - Apple Support

But before you do that go to Settings > Battery > battery using by app , Check out the applications that consume the battery heavily. If there is nothing that consumes the battery heavily, there may be a technical problem Or if you replace the battery by a store that is not approved by Apple, it may be non-native and may cause the battery to drain or if your battery health is 80% or less!

and also see this article’s might help you:

• iPhone Battery and Performance - Apple Support
• Charge and Monitor the iPhone Battery - Apple Support
• About the Battery Usage on your iPhone - Apple Support
• About Optimized Battery Charging on your iPhone - Apple Support
• If you see "Your iPhone Battery may Need to be Serviced" - Apple Support
• Use Low Power Mode to Save Battery Life on your iPhone - Apple Support

Hey there,

what is the problem with your battery?