Upload & Sell: On
I shoot horse shows with my 5D3, and the battery life has been excellent. I can get over 1000 shots in a day and still have battery life left. I did buy an extra battery, but have never needed to use it.
Incidentally, this season I have used the camera in all kinds of awful conditions, hot, humid, pouring rain, cold, dusty. I'd been using 1-series cameras exclusively until I got this 5D3, and I am very impressed with it.