Battery check SMART FourTwo 2007 - 2012 | Haynes Manuals
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Locate the battery - it is set into the floor
First, lift up the carpet
Check the Negative (-) terminal clamp is tight
Open the 'Positive' (+) protective cover
Check the Positive (+) terminal clamp is tight. CAUTION If using a spanner to tighten terminal, be careful not to short it on the bodywork
Check battery is generally secure, if loose, tighten the battery retainer
The battery in position
Tighten if required, a 10mm socket or spanner is needed. Not too tight because you may damage the battery casing. Replace carpet