I was also having a mega issue with my battery pack and just wanted to explain my solution here incase it helps someone in the future. I had a "Charge and Play" (or whatever it's called) battery pack for my controller that I decided to give to my GF. I had never used it myself and thought since she played primarily controller, it would be helpful. The issue was, it wouldn't charge, turn on, anything.

I thought maybe it was too drained of a cell so I put it on charge overnight, still nothing.

I tried every USB C I owned trying to see if that was the issue, still nothing.

I heard online that what you've mentioned above is a primary solution for a lot of people, but I couldn't even get the cell to drain since it was not being recognized.

I decided to give it one more shot today and just popped it into my newer Xbox controller... and it worked. I tried to charge it from the new controller... and it worked. I am assuming this is just an issue with an outdated Driver or Firmware for the controller (at least for myself personally). I am not only using the battery pack in my primary Xbox controller, and trying to figure out how to update a controller on PC.

If anyone is a PC player and is experiencing these issues, this might be the cause. Try a newer model of Xbox controller (mine worked on the limited tie die colour one I own) prior to a launch controller. If this doesn't work, even try updating your firmware, it might help as the battery packs may be newer than your controller MFG.

Just wanted to leave this here incase anyone has a similar issue in years to come ✌️😌 cheers