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61 20 900 Disconnecting and connecting battery negative lead

WARNING: Observe SAFETY INSTRUCTIONS  for handling vehicle battery.
Follow instructions FOR DISCONNECTING AND CONNECTING BATTERY!
Observe notes on power supply / on intelligent battery sensor (IBS).

Necessary preliminary tasks: 

Security version: 

Loosen nut (1).

Tightening torque 61 21 1AZ .

IMPORTANT: Do not under any circumstances use force to pull off pole shoe.
Do not under any circumstances release socket-head cap screw of IBS.
Fig 1: Identifying Nut
G04768534Courtesy of BMW OF NORTH AMERICA, INC.

Detach battery negative lead with IBS towards top, lay to one side and secure.