Hi - Have had the Forerunner 645M haven't had any issues with it. But I can't get long battery life out of my Jaybird headphones. I had X3 during a run only got 25 mins out of the before completely dead from full charge. They were old so I got new X4 lasted a little long then again would be completely dead after 35 mins. So I took them back and got the Tarah Pro's. I get about 1:15 hour out of them then they are dead. My last run they died after a full charge around an hour now I can't even get them charged again. Has anyone had this issue? I do run with GPS and music but I wouldn't think that would shorten the life of the headphones. Is there a setting I am maybe missing?