charging port, slow charge

@redeye13 sounds like either a bad battery or a bad charging board. This "after unplug and re plug, sometimes have to do couple of times" sounds more like the charging board. Replace one, then the other to narrow it down, or replace both and be done with it :-)

Since iFixit does not yet have a guide for this, use the Samsung Galaxy Note20 5G Disassembly & Reassembly instructions. Instead of a hot plate you can use a good hair dryer or a heat gun (low settings) to replace the screen

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!