Battery Protection MOSFET 8205A Replacement
As a general part search - there is a website called Octopart that can be used to find suppliers of a given component.

For the specific part you are after (8205A dual MOSFET) Octopart does not come up with the part you are after.

I turned to Google and found that your part can be bought from AliExpress:
https://www.aliexpress.com/item/Smd-8205s-8205a-sot23-6-lithium-battery-protect-ic-20pcs-free-shipping/1977980871.html

This gives us the following information about the part:




  From this I found a compatible part from DiodesInc:
  DMG9926UDM (DigiKey)  


And a similar part with ESD protection:
DMG6968UDM  (DigiKey)

There are many other suitable dual MOSFETs on each suppliers website. Alternatively, you don't need a dual MOSFET, you could simply just use 2 seperate N-ch MOSFETs.