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61 20 900 Disconnecting and connecting battery negative lead

WARNING: Observe SAFETY INFORMATION for handling hybrid cars.
Disconnect HIGH-VOLTAGE SYSTEM  from power.
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 negative lead, it must be ensured that the vehicle goes to sleep. Observe a waiting period of at least 2 minutes.
IMPORTANT: Do not under any circumstances detach or lever off intelligent battery sensor (2) from battery by force.

Loosen nut (1).

Tightening torque: 61 21 1AZ .

Remove the intelligent battery sensor (2) from the battery and secure the ground cable (4) on the side.

Fig 1: Identifying Plug Connection, Nut And Battery Earth Lead
G10098151Courtesy of BMW OF NORTH AMERICA, INC.