My G10S wireless transmitter just died. I got it for Christmas. It was plugged into my Charvel with active pickups. The Charvel battery died so I left the G10S transmitter plugged in while I changed the 9v. I was careful to install the battery correctly. When I did it I noticed that the light in the transmitter was solid red. I figured that the G10 battery was dead. I plugged it into the base to charge. After a few minutes I started to smell a burnt wire smell. I removed the transmitter from the charger and discovered that the unit was very hot to touch. I called Line 6 and I need to send the unit back to them for a replacement. Unfortunately, I am told they have none in stock and it will be weeks. He offered the G50, but having the transmitter attached to a guitar strap then running a short cable to the transmitter won;t work for my recliner style of playing since I don't use a strap.
The next time I will remove the transmitter before changing the battery. I played the Charvel after for a couple of hours. Whatever caused it I think the transmitter battery started to have a thermal runaway when I placed it in the base unit for a charge. It was very hot for a long time. I almost considered leaving it in the yard in case it caused fire!