In the second part of his video, he shows himself setting up the power by switching the ground and positive voltage wires so that he can charge the batteries without harming the other devices.
My first question, can someone give more details about this, I plan on doing the same thing but I felt his description was rather vague for a beginner.
My second question, would you need to flip the ground and positive wires on the charger itself, or is it fine to just leave it alone?
Thanks.