NOVELTY - The battery management system includes BDU (10) having positive switch (12) set in current path (20) between positive terminals (22,24), and negative switch (14) set in current path (26) between negative terminals (28,30). A pre-charge cartridge (230) includes terminals (232,234) and current path (236) between the terminals. The terminal (232) is connected to one of the terminals such as positive and negative terminals on the BDU.    USE - Battery management system for EV and HEV.    ADVANTAGE - Provide battery management system with BDU that perform fusing by interrupting the flow of current between the battery pack and the electrical system when magnitude of the current, or the duration for which the current is at the magnitude, is greater than a predetermined value, perform external charging by controlling current flow between the battery pack and the charger on the EV connected to the power source outside of the EV such as EV charging station and perform pre-charging by controlling current flow from the battery pack to other components of the EV e.g. inverter to protect the components from current surges. Enable BDU to also perform terminal interfacing by including a terminal that satisfies the requirements of a particular vehicle application related to e.g. terminal type, terminal size, and/or whether the terminal is touch-proof and as well as perform current sensing by measuring current flow through high current paths between the battery pack and the electrical system. Pre-charge relay and other components of BDU such as auxiliary fuse, Hall Effect sensor and shunt sensor are moved to the pre-charge cartridge to improve the versatility of the BDU.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic diagram of the pre-charge cartridge connected to modular BDU.    BDU (10)    Positive switch (12)    Negative switch (14)    Current paths (20,26,236)    Positive terminals (22,24)    Negative terminals (28,30)    Pre-charge cartridge (230)    Terminals (232,234)