There are issue with battery drain on iOS 13.5.1

Hello and welcome to Apple Support Communities, Myroman

If we understand your post correctly, your iPhone is not holding a charge as long as expected. We’d like to help.

Follow the steps in this guide to check your battery usage information:

Maximizing Battery Life and Lifespan

Let us know if that resolves this issue for you. 

Thanks for using the Apple Support Communities. Take care.