Battery check Audi A6 2004 - 2009 | Haynes Manuals
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Locate the battery – it is in the boot
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 the spanner on the bodywork.
Check battery is generally secure, if loose, tighten the battery retainer
The battery retaining clamp position
To tighten, a 13mm socket is needed. Not too tight as you may damage the battery casing