With things learned from the initial prototype, work has progressed on several improvements/revisions. Two of the important pieces of the system are the power pack controller and the battery management system active balancing boards. With the schematic and PCB designs completed, they were then fabricated. Next up will be testing.
Active BMS board on one of the battery modules 
Underside view of the active BMS board 
Top view of the pack controller including the isolation detection module 
Side-by-side views of the pack controller and active BMS boards