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61 20... Disconnecting and connecting both battery earth leads (Plug-in Hybrid Electric Vehicle)

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WARNING: High-voltage system - danger to life!
The following points must be strictly observed prior to starting work: 
WARNING: Observe SAFETY INFORMATIONS for handling battery.
Follow instructions for DISCONNECTING AND CONNECTING BATTERY .
Follow instructions on INTELLIGENT BATTERY SENSOR (IBS) .

Necessary preliminary tasks: 

IMPORTANT: Before disconnecting the battery earth lead, it must be ensured that the vehicle goes to sleep. Observe a waiting period of at least 2 minutes.

Main battery: 

IMPORTANT: Do not use force to pull or lever intelligent battery sensor (IBS) (2) off from battery.

Loosen nut (1).

Tightening torque 61 21 1AZ .

Remove IBS (2) from battery and secure at side.

Fig 1: Identifying Lever Intelligent Battery Sensor And Nut
G09928705Courtesy of BMW OF NORTH AMERICA, INC.

Auxiliary battery: 

Remove service flap (1) from luggage compartment trim panel on the right.

Fig 2: Removing Service Flap From Luggage Compartment Trim Panel On Right
G09928706Courtesy of BMW OF NORTH AMERICA, INC.

Auxiliary battery: 

IMPORTANT: Do not use force to pull or lever intelligent battery sensor (IBS) (2) off from battery.

Loosen nut (1).

Tightening torque 61 21 1AZ .

Remove IBS (2) from battery and secure at side.

Fig 3: Identifying Intelligent Battery Sensor And Nut
G09928707Courtesy of BMW OF NORTH AMERICA, INC.