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Disconnecting all battery ground leads

Preliminary work 

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 ON THE LITHIUM ION BATTERY .
G15340242Courtesy of BMW OF NORTH AMERICA, INC.