Adding A Recharge Port To a ROTJ

Greetings,

I was hoping someone could help me with a wiring diagram. I have a MR ROTJ Skywalker soundboard which still runs great. I would like to add a recharge port to it but don't know to. All of the searching I have been doing just keeps this main pic popping up.

Attachment 18169

While the pic is great at identifying all the wires it doesn't show you anything on a recharge port. Is there anyone who still remembers these and better yet, know how to wire in a recharge port?

Thank you to anyone who can be of assistance!!!

Ok, here is the recharge port pic. It’s pretty self explanatory. Board and battery (+) and (-) go where they’re labeled.

Attachment 18170