Apple iPhone 6s Gold, completely junk

Items offered for a cat rescue activity.
I have absolutely no knowledge of this.
Please consider this completely junk.
Gold iPhone 6s.
The exterior is fairly clean, but there are sticker marks from a case on the back and small scratches on the corners.
The screen area looks somewhat yellow. There's a sticker on the surface, so I can't tell if it's the sticker or the screen.
The battery shows 80%.
It can be charged, but I was told that if you turn it off, the battery may drain as shown on the screen.
It seems that when you turn it back on, it will show the charge again.
For those who can fix it themselves.
I don't know how to check the storage capacity, but I've set it to 64GB for now, so please understand.
It seems to be initialized.

Power and charging only, all other functions untested.
Parts only, capacity unknown.
This is a junk item.
Please purchase only if you understand.
Please refrain from purchasing if you are sensitive to these issues.
Please make your judgment based on the images.
No claims, no returns.

Series...iPhone

Model Name...iPhone 6s

Functional defects...Yes

Smartphone color...Gold