lol... i had to cross post that shit over to my board.. I can be the GoPro hero over there thanks to you..
I'm sure I have posted videos.. and 4 hours? I dont know about that but we run about 7 sessions a day.. around 20 minutes each.. i prob would not fill the SD card but I prefer to have it available..
Batteries, for sure run out.. and the damn camera will flash its red light like it turned on and only later .. like when you get back to the hotel or home to check out the videos, do you know the batteries really didnt power enough ro do anything but shut itself off.
I usually carry two sets of lithium batteries, and change them at lunch. And two 2G SD cards, and either switch them or clear them out onto the laptop.