hi mate,
just to make sure but are you asking if you need 2 supplies to plug into both the mount itself and the hand controller at the same time?
if so you only need to plug the power jack into the mount head itself to power it, the jack on the hand controller is for when it is unplugged from the mount (ie. installing newer firmware)
i just use a small 17ah SLA battery to power mine, can get multiple nights off of 1 charge
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