Something I've heard, but not checked or tried, is that you can secure a pocket warmer near the battery compartment on the camera (probably wrapped in a couple of layers to reduce the direct heat) to keep the in camera battery warm to improve battery life.
I'd be interested if anyone has tried this, or knows a reason why this technique shouldn't be used (other than of course having something a little too warm coming in contact with the plastic). Only other this I could think of would be introducing noise to the sensor maybe?
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