iPhone 8 Not Charging But Maked Sound

Hello. i have searced on the forum without the answers helping me. My problem is I have a iphone 8 with an unoriginal battery. I bought it from soemone as a repair phone. Now it connects to itunes and says its charging on itunes, however on the phpne it only makes the charging sound but no charging icon on the iphone.

so the iphone is stuck on 1%, I think its the battery. But the previous owner replaced the battery again without results.

what I have tried:

Electrical tape on the back of the battery connector

tried brushing the connection (no alcohol or so kust a toothbrush without anything)

tried hard reseting iphone and restoring it through dfu mode

I have also tried different chargers etc. Nothing wrong with my hargers.

i have 1 thing left to try and that is wireless charging if it works or not. If the wireless charging don’t work its the battery, RIGHT? Also ordered a new battery not apple ofc but oem standards and through a supplier I know with 100% quality guarantee. So my last things to try is wireless charging and new battery.

cuz the charging port works right? It does make sound and connects to itunes and powers on , just shuts down after a few minutes when using it, and then it can’t be the charging port?

please help :)

EDIT:

Okay I tried wirelss charging. Gives me same result. Shows charging on lockscreen, but not the charging icon. The phone is stuck on 1% without charging. So since it connects to iTunes and wireless dont charge or charging with cable its the battery then? It cannot be anything else then I think.