Battery check BMW 6-Series 2004 - 2009 | Haynes Manuals
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Locate the battery, which is in the boot. Open the battery cover
Check the Negative (-) terminal clamp is tight
Check the Positive (+) terminal clamp is tight. CAUTION If using a spanner to tighten terminal, be careful not to short it on the bodywork
The battery retaining clamp position
To tighten, a 13mm socket is needed. Not too tight because you may damage the battery casing. Replace the battery cover