BATTERY SYSTEM

The present invention refers to a control system (90) for a battery system (100), the control system (90) comprising a power switch (13) that is configured for disconnecting the battery system (100) from an external load (14) in response to a control signal (41, 42). The control system (90) also comprises a battery system manager, BSM, (20) with a first microcontroller, MCU, (21) configured for performing at least one control function with respect to the battery system (100) and for controlling the power switch (13) via a first control signal (41). The control system (90) further comprises a battery disconnect unit, BDUe, (30) with a second microcontroller, MCU, (31). The BDUe (30) is configured for detecting an output current of the battery system (100) and for transmitting a current signal (44) that is indicative of the detected output current to the BSM (20). The BDUe (30) is also configured for controlling the power switch (13) via a second control signal (42). The control system (90) of the invention further comprises a multiplexer (35) that is configured for receiving the first control signal (41) from the first MCU (21) and for receiving the second control signal (42) from the second MCU (31). The multiplexer is further configure for outputting one of the first control signal (41) and the second control signal (42) to the power switch (13), preferably in response to a fault signal (43) indicative of whether the first MCU (21) is in an operable state or not.