A charge port is basically a piece of plastic with two pieces of metal inside. It just connects the + of the charger to the + of the battery, and the - of the charger to the - of the battery. You can use and kind of plug that has the two metal pieces, a jack from a psone screen, a molex connector (common power plug in computers) or most other kinds of header. (headers are the plastic plugs that you use to connect wires without solder)