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China Ball

assuming you dont have power on set, I have powered a number of small lighting setups with a battery pinch and V-mount battery when power has gone down or arrived to find out theres no power. They normally have 12v out / d-tap and have a bunch of cable converters.

If you are needing to move around with the light always being powered, you could attach a v-mount battery plate to your belt or put it in a backpack while you walk around powering the china ball.