I have same problem with my A50 gen3 Xbox version. I read someone here just wiggled the scrolling wheel and it worked. So, I grab the scrolling wheel and wiggled it a lot, with light force, and it was fixed! Let's hope it last, cause Gen4 doesn't look promising to me, maybe Gen5 Edit: Issue came back and wiggiling didn't seem to work again :(

You did everyrhing except the most important part to me

How did you unsolder the battery, and solder the new battery?

I was going to buy the tools from the local store but realized i don't know how to appropriately unsolder/solder battery tabs.

Non the less you are the only one who made such explanation, thank you.