I got a used Rad2Go bike from a family member to fix up

This bike has 2 packs of 3 batteries (12v 12ah) and charges through a port on the front using an external DC converter.

2 Questions about charging:

1: If one battery pack is NOT plugged in, will the bike charge?

2: The battery packs each have the same plug as charger-does that mean the battery packs can be plugged into the charger directly?

Thanks!