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Home >> BMW >> 2021 >> 840i xDrive 2D Convertible >> Repair and Diagnosis >> Accessories & Equipment >> Steering Column Switches >> General Electrical System -- Repair (G14, G15, & G16) >> 61 21 Battery Replacement >> 61 21 085 Removing and installing 12 V lithium ion auxiliary battery ((all 8' series Gran Coupe sedan models 2020-) >> 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.
G15667738Courtesy of BMW OF NORTH AMERICA, INC.

Follow-up work