Remove and install or replace battery (M4 Convertible)

To ensure the correct safety and convenience functions, install only the original battery (battery size and type) stored in the vehicle order. Observe note on BATTERY REPLACEMENT .

Necessary preliminary work: 

• Clamp off BATTERY CABLE FROM NEGATIVE TERMINAL .

Release screws (1).

Tightening torque 61 21 5AZ .

Remove retaining brackets (2).

Detach vent hose (3) from vehicle battery (4).

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Installation note: 

The battery has two vent holes:

• One vent hole (1) must be closed correctly with a dummy plug.
• The vent hose (3) must be connected correctly at the other vent hole (2).

Always install the vent hose (3) with a downhill gradient to the outside!

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No siphon formation!

Fold up cover (1) on safety battery terminal (2).

Loosen nut (3).

Tightening torque 61 21 1AZ .

Do not under any circumstances pull/lever off safety battery terminal (2) by force.

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Pull off safety battery terminal (2) towards top, lay to one side and secure.

Release screws (1).

Tightening torque 61 21 5AZ .

Remove screws with battery holder (1).

Remove battery (2).

Installation note: 

Make sure battery is correctly seated in mounting.

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Replacement: 

• REGISTER BATTERY EXCHANGE .