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Home >> BMW >> 2021 >> 840i 2D Convertible >> Repair and Diagnosis >> Accessories & Equipment >> Steering Column Switches >> General Electrical System -- Repair (G14, G15, & G16) >> 61 21 Battery Replacement >> 61 21 003 Removing and installing the 12V dual storage system >> Removing the 12V dual storage system

Removing the 12V dual storage system

Preliminary work 

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.
G15667664Courtesy of BMW OF NORTH AMERICA, INC.