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Home >> BMW >> 2021 >> 840i xDrive 2D Convertible >> Repair and Diagnosis >> Accessories & Equipment >> Steering Column Switches >> General Electrical System -- Repair (G14, G15, & G16) >> 61 20 Battery General Information >> 61 20 900 Disconnecting and connecting battery ground lead >> Connecting the negative battery cable of the auxiliary battery in the engine compartment

Connecting the negative battery cable of the auxiliary battery in the engine compartment

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» The auxiliary battery is not installed in the engine compartment.

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» Vehicle electrical system support battery is installed.

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» 12-V dual storage battery is installed.

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» 48-V battery is installed.

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