Recently, I dug out my mother's Series 0 Rose Gold watch that's been stuck in a drawer for maybe a year or more. When I try to charge it, it says "Charging with this accessory is not supported by Apple Watch" and it stays stuck at 10%. I let it discharge for 3 days and tried charging it again, but it still repeats the same message. It seems other people had the same issue around the time of release, but so far I haven't been able to find any solutions that work.