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Home >> BMW >> 2021 >> 750i xDrive >> Repair and Diagnosis >> Accessories & Equipment >> Steering Column Switches >> General Electrical System -- Repair (G12) (1 Of 2) >> 61 20 Battery, General Information >> 61 20 900 Disconnecting and connecting battery ground lead (All negative battery cables) (740i 2016-2022, 740i xDrive 2017-2022, 750i 2016-2019, 750i xDrive 2016-2022, M760i xDrive 2017-2022) >> Disconnecting the negative battery cable of the 12-V lithium-ion auxiliary battery

Disconnecting the negative battery cable of the 12-V lithium-ion auxiliary battery

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.
G14198362Courtesy of BMW OF NORTH AMERICA, INC.