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61 20 900 Disconnecting and connecting battery earth lead

WARNING: Observe the SAFETY INFORMATIONS for handling the battery!
Follow instructions FOR DISCONNECTING AND CONNECTING BATTERY !
Observe notes on POWER SUPPLY /on intelligent battery sensor (IBS).

Necessary preliminary tasks: 

For F30; F32; F35; F80; F82: 

NOTE: With lead-acid battery (F3x only).

Loosen nut (1).

Tightening torque: 61 21 1AZ .

IMPORTANT: Do not under any circumstances use force to pull off negative terminal.
Fig 1: Lead-Acid Battery Nut
G10098406Courtesy of BMW OF NORTH AMERICA, INC.

Pull off battery negative lead and IBS (2) in an upward direction, place to one side and secure.