I cahrged my 2 month old 42mm galaxy watch overnight on the supplied charging cradle. My alarm went off this morning and I turned it off, with my watch wishing me a good morning and telling me it was at 100% charge.
I put it back on the cradle while I got out of bed, then picked up the watch and put it on, only to realise it had turned off. It would not turn back on at all, no matter what I tried. After an hour or so I tried again and it looked like it tried to turn on, so I popped it back on my charging cradle, where it told me it was at 0%!!!!!!!!!!!!!!