5D2 Error 80

Are error codes the same as the older bodies, shutter not charged or something like that?

I packed my 5D2 up in a bag, and left it on, granted the batteries were probably at about 50% or less. Parked and left it for about 1/2 hour. It got a little warm, got home swapped out to the 70-200 2.8is, and the screen would not come on, UH OH!

Then let it sit for a while and tried swapping lenses. It came back on, with 1 bar of battery life.

So hopefully it just got a little too warm, anyone experience this yet, or is this something to worry about if it doesn't come back?

Phew, canon said low batteries + temp (something like 105 degrees), it will throw the err code. Nothing to be alarmed at, yay

Did the err ever showed up again?

I had err 80 code last weekend as well. The camera was on sleep mode and I changed the lenses after I left it in the trunk for few hours then it threw me this code. Only thing is that the temperature was way below 100 degrees.