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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 21 Battery (12V And 48V) >> 61 21 086 Change 12-V lithium-ion auxiliary battery - register with battery replacement - (all 7' series models 2016-2022) >> Installing the 12-V lithium-ion auxiliary battery

Installing the 12-V lithium-ion auxiliary battery

WARNING: Working on 12 V electrical system. 
Risk of short circuits! Risk of fire! 
  • Make sure that there is no charger  connected to the jump start terminal in the engine compartment.
  • Detach battery ground lead from battery.
  • For auxiliary batteries: Detach battery minus cables from all auxiliary batteries.
WARNING: Unprotected battery terminals. 
Risk of short circuits! Risk of fire! 
  • Cover the vehicle battery.
TIGHTENING TORQUE SPECIFICATIONS

Battery cover to battery carrier 
Nut M6 Tightening torque  8 Nm
G14198416Courtesy of BMW OF NORTH AMERICA, INC.
WARNING: Incorrect screw connection of the positive battery cable. 
Risk of fire! 
  • Ensure that the positive battery cable is screwed with the correct  nut.
G14198415Courtesy of BMW OF NORTH AMERICA, INC.
TIGHTENING TORQUE SPECIFICATIONS

Positive battery cable to 12-V lithium-ion auxiliary battery 
Nut M8 Tightening torque  19 Nm
TIGHTENING TORQUE SPECIFICATIONS

Positive battery cable to 12-V lithium-ion auxiliary battery 
Nut M8 Tightening torque  19 Nm
G14198414Courtesy of BMW OF NORTH AMERICA, INC.
G14198413Courtesy of BMW OF NORTH AMERICA, INC.

Follow-up work