(3) use the wire cutters to peel the ends of the cables and leave around 1-2cm length of copper without cable tube.

you want to create an asymmetric shape so that there is no lump from stacking the cables when you solder them

you also need to cut and prepare the other end of the cable, the one with the connector. Do the opposite of what we did in the charger end, in the connector end, the black cable should be longer and the white cable shorter