Frame rate and battery effect.

[house_of_el_don]

So a quick question. I usually run my GoPro at 4k at 24 frames. Today while filming some large surf I changed it to 1080 at 120 frames. I also noticed a large drop in my flight time, down from 18 minutes to about 12. Is this just a coincidence from a bad charge, or does frame rate/resolution affect your flight time? Is it because of the amount of data now going to the controller due to high frame rate? Am I making much ado over nothing? Help a pilot out here!