IPhone 12 mini battery drains fast even on low power mode

Just received my Iphone12 mini and I noticed that the battery drains fast. I did watch some videos on how to save battery and followed some of the tips but still, the battery drains fast.

I charged it to 100% yesterday and had it onnlow power mode with wifi, battery got to 96%. I decided to turn off the wifi and be on low power mode and didn’t use it for more or less 3-4 hrs and when I checked it got to 80%.

i tried using it without wifi and just browsed some settings, and the battery decreased even faster to 76% with less than 10mins of use. Now, I am using it with wifi and it’s down to 69% in less than 30mins. Is this something I should worry about or should I consult apple support to have it checked incase it’s defective or what?

I’ve read some of the comments from other post similar to this, and I was wondering if you guys have consulted an apple expert and see if this is something that needs replacement or what.