It could as with anything using electricity. A light bulb, a computer, a camera. The surge of electricity is likely suppressed as much as possible in a camera, but I recommend using a 270 Wh camera that might get you through the day. I shoot for several hours with that battery and if I had a much longer requirement, it would be nice to have two batteries!
I’m going to have the same issue in June on a shoot that occurs for about 8 hours but when I have a break I’ll partially charge the battery.
Sure turn it off between shoots, lunch, etc. But frequently turning it off and on might defeat the goal of saving electricity in the battery. The camera likes to be powered on for several minutes to become stable so in run’n’gun you might miss a shot or cause other delays. And I’m sure the battery itself actually continues to drain slowly if it’s mounted on the camera with the camera off. If it’s critical to conserve charge, remove the battery when the camera is off.
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