This is the Veteran Sherman Battery Management System (BMS)

1. These two pack are one set as per wiring
2. This is signal wire which connected to mainboard
3. Here is singlechip with firmware inside. If there’s anything wrong with battery packs (1600wh per 2 pack), the battery signal wire will reflect problem to mainboard, mainboard will stop charger charging.
4.. The top and below battery pack are not the same. You can see there are numbers on BMS on each build, each have separate BMS