I was asked to do a shoot for our band's CD - the picture they wanted to use originally didn't work out. I had just a few days so had to take what mother nature offered, which was temperatures down to 7 degrees F (-14 C) during late night / early morning times I had to shoot. I was expecting problems with batteries at the very least.
I had a set of Eneloops in the camera and kept a spare set of lithums in my pocket, but the K200D finished 4 hours in the cold with 3 bars still showing on the battery meter. Near the end, I think the exposure meter started drifting a bit - there was a layer of frost on the outside of the camera and I had changed lenses several times so not too surprising, I guess.