The battery box needed an external charging connector and a way to lock it down. This makes it more convenient for recharging and more secure when parking at the store. I can leave the box locked to the bike and charge it up without having to take it all apart.
This video shows me installing the external charging connector and fabricating the latch for locking it down.
I mention it in the video but want to reiterate it here; it is very important to get the wires hooked up to the correct terminals. Switching the positive and negative wires could cause damage to the batteries and the charger and possibly fire or worse. Be careful when working around electricity in any form. It can be dangerous.