@olsensan I think you are on the right way and I also believe in fixing things. Keep going with your excellent troubleshooting. The only thing I suggest at this time is that you get yourself an inexpensive USB Ammeter and see if your headset draws any amperage. Your battery voltage does not change which could be okay at 3.2V but lets see what happens when you plug it in and monitor the amperage. also, check the actual charging port to make sure that it is clear of any debris and nothing bend or corroded. Then try another cable and USB charger to see if that helps.