Battery check BMW 3-Series 2005 - 2008 | Haynes Manuals
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Locate the battery, it's in the car's boot
Open the battery cover
Place the cover to one side
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
If you have to replace the battery or alternator, click below
To tighten, a 10mm socket is needed. Not too tight as you may damage the battery casing. Replace cover