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Bjorn Nyland did a test the other day where he said that his camp mode was consuming too much power.
I have used camp mode in the past and I know that his setup was wrong.
I tested camp mode on camera right away at similiar conditions (same or even worse) - my battery was cold and the cabin wasn't pre-heated. I packed the results in the video.
One take from the video - you can't disable the screensaver in camp mode. Even if you turn the screen cleaning mode on.