Disconnecting the negative battery cable of the system battery

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Preliminary work

Refer to REMOVING THE LUGGAGE COMPARTMENT FLOOR COVERING .

Precondition

Ignition is switched off.

WARNING: Deactivate the 12-V electrical system .
Risk of short circuits! Risk of fire!

Make sure that there is no battery charger connected to the jump start terminal in the engine compartment.
For vehicles with additional electrical systems (48 V electrical system, high-voltage vehicle electrical system), this absolutely must be deactivated before the vehicle battery is disconnected.

NOTE: TECHNICAL INFORMATION
Follow notes on lithium-ion battery. See NOTES REGARDING THE LITHIUM-ION BATTERY

Slacken nut (1).
Detach the negative battery terminal (2) from the negative battery terminal.
Put the battery ground lead to one side and secure it.

Courtesy of BMW OF NORTH AMERICA, INC.