Not sure how mobile your camera has to be, but....
Whenever a peripheral or device requires 12v, I always consider batteries, especially old drone batteries. I presently use a 12v router for my mapping missions, and an old Phantom 4 battery does an awesome job. By my estimate, I'm getting about 80 hours continuous use out of that battery, which easily equates to over a dozen jobs before I have to even think about the battery. Knowing how much capacity I have left courtesy the LED's is a godsend in the field. And, of course, having a spare on hand is a piece of cake. I just retired batteries that have over 90 flights on them, and they still work perfectly for these low-current devices.
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