Okay I misunderstood you. I went to the screen you are talking about, tapped edit, customize and there is no longer a battery widget in that list in iOS14. On that screen to the left of the Home Screen tap edit then at top of that screen (the one with customize on it) tap the (+) symbol, the available widgets pop up. Scroll down to find batteries. Tap on it and you have three options for battery widget. Swipe left to see the three options. I know the widget you are talking about. The third widget available looks like the one that used to be in previousm iOS.
I use the first widget for batteries and I don’t use the screen you are referring to. Mine is on a screen I’ve setup for utility type apps. I don’t use the App Library