I put the charger on my watch last night and woke up to almost 0% battery and a message that [paraphrasing] "The Apple watch is not supported by this device" .. I bought the charger from Apple online as an extra, so i could keep the other one in my purse for an emergency. Also, both the watch and charging disk were VERY hot this morning. I had plugged the USB portion directly in to a power strip that has a USB port. This morning I have it charging with the charger that came with it and it is plugged in to the Apple "piece" and then in to an electrical outlet. It seems to be charging OK right now. I will call Apple later when I have time but does anyone know what's going on!