Strange phenomene on iPhone 12 Pro

[macuseri]

Hello everyone, I have discovered a strange phenomenon with my iPhone 12 Pro. In standby, the iPhone loses about 1% per hour. However, when I use it, I can literally watch the percentage drop. There is nothing suspicious in the settings under "Battery" that seems to be sucking a lot of battery power. Do you have any tips that could help me?
A few details about my iPhone: As I said, it's a 12 Pro, iOS 14.5.1 is installed. The provider is Sunrise (Switzerland) and the modem version is 46.0.
The background update is completely turned off, I don't have iCloud, and the iPhone is plugged in every day. During the night, the iPhone loses about 7%. Is this normal?
For example, today the iPhone lost a whole 7% between 07:30 h and 10:00 h (without using it (from 100% to 93%)).

Greetings and thanks in advance for helpful answers.

 

[macuseri]

But I changed my provider a few weeks ago.

 

[MacInWin]

This video was out yesterday: Video: Make Your iPhone Last Longer With These Battery Preserving Tips

 

[chscag]

Plus one for watching the video that Jake suggested.

I went through all the tips with my iPhone 12 that the video presented. I was surprised to find out how much battery I was wasting with my settings. Most of those settings by the way were defaulted by Apple.

You might also want to review these battery saving tips. This is not a video so you can go thru them at your leisure:

iOS 15 Battery Drain: 29+ Tips to Make Your Battery Last Longer

With every new operating system update, there are complaints about battery life and rapid battery drain, and iOS 15 is no exception. Since iOS 15 was released, we've seen reports of issues with battery life, and an uptick in complaints with each new point release since then. iOS 15 battery...

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