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Home >> Mini >> 2010 >> Cooper S, 2D Hatchback, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2699 (Engine Electrical System - Repair - E90 (N51)) >> 1200 Troubleshooting >> 1200... Instructions for disconnecting and connecting battery >> Vehicles with a two-battery system >> Starter and system battery

Starter and system battery

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A two-battery system has a starter battery circuit and a system battery circuit. An auxiliary control unit monitors both battery circuits. Depending on the situation, the battery circuits are connected to or isolated from the auxiliary control unit via an cut-off relay.

Two AGM batteries, whose design and properties are described in AGM BATTERIES , are used as a storage battery.

IMPORTANT: These batteries must not under any circumstances be charged with a voltage in excess of 14.8 V. Rapid programs must not be used either.
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