Does shooting RAW vs JPEG have a significant effect on battery life (i.e. > 10% in the number of shots that can be taken)? Has anyone done controlled tests on this?
JPEG means more processing, RAW means much more data written to the card. Both consume energy, so the answer is not clear.
I am interested in maximizing battery life while shooting timelapses, so let's assume a scenario where other factors affecting battery life are fixed (AF and VR turned off, back LCD not used) and JPEG size is set to small (thus the files sizes are significantly smaller than RAW).
Google turns up quite a few discussions on the topic, but all of the answers I've seen are either pure guesses (even the very confident sounding ones) or based on vague impressions from regular shooting, not timelapses or a controlled experiment. Some suggest (1, 2, 3) that based on their experience shooting RAW might consume more power.