I just went for a run. When I left my watch was on about 80-90% battery. I left my phone at home and listened to music through wireless headphones attached to my watch and tracked my run on my watch. During my 9th kilometer the watch suddenly shut off having given me no low battery warning. I had been running for about 50 minutes at that point. My battery is normally fine and it is a very new watch. Only a few weeks old. I have followed the advice on here about dealing with battery drain. What else can I do?