Battery check Audi A3 2008 - 2012 | Haynes Manuals
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Locate the battery
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 the spanner on the bodywork
Check battery is generally secure. If loose, tighten the battery retainer
To tighten, a 13mm socket is needed. Not too tight as you may damage the battery casing
Replace the battery cover