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. Replace cover
Check battery is generally secure, if loose, tighten the battery retainer
The battery retaining clamp position
Tighten if required, a 10mm socket is needed. Not too tight as you may damage the battery casing. Replace battery cover