Battery Consumption too high

Solution 1:

My question is simple, how and why do I have these problems? Could they be caused by a widget?

It can be caused by anything including (a) widget(s).

However, in this case, it's an issue with iOS 14.

• Apple Confirms iOS 14 Battery, Data Problems For iPhone Users
• iOS 14 Battery Life Bad & Draining Fast? Here’s Why & How to Fix It

I have personally tested this after experiencing severe battery drain on my iPhone after upgrading to iOS 14.1 by reverting to iOS 13 via a restore from backup. When I did, the issue went away.

What can you do to fix? There are some tips like ensuring your apps are updated and closing apps (not suspending them) when not in use. I personally just keep the phone plugged in all the time and I'm waiting for a new release that hopefully fixes it (actually, I'm waiting for the iPhone 12 mini instead).