How did these lights work??

As soon as i knew there was going to be a Flux Capacitor in the door it always had to light up but not wanting a permanent cable route to the door it had to be battery power but also all the switch cables had to be hidden as seeing wires on this beautiful l door was not an option so here is exactly how its done. Check out thefull videos on my chaneel to see how this and the whole underground system was built.