I've had past issues with my Tracker too. Once I checked it in the parking lot and it showed something like 93% battery life. After a short skin up, we stopped to do some beacon practice and I pulled it out and it was powered off and wouldn't turn on. The batteries were evidently dead because it came back on with new batteries. That was a little disconcerting.
"People say that marijuana smoking is going to get in the way of my career. I say to them that on the contrary, my fighting career is getting in the way of my marijuana smoking." -Nick Diaz