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Buck converters are so cheap, I would get one just for the simple fact that stepping down the voltage will increase your run time. A fully charged M18 will also put out more than 20v, so you run the risk of a voltage being above the designed specs.
So after some research I've fiquired I'm going to run 2 separate batteries , a m18 12ah for livescope black box and an m12 9ah for the 93 .I have 2 each of them for multiple days without coming of the ice and no step-down required and from.what I've read I'll need about 1.5 ah per hr running them