Buzzing noise on starting

Hi, I have a 2006 micra 1.2 which is making a short buzzing, almost like a beeping, noise when starting. It starts 1st time no problem with no sounds of the starter struggling at all, it just makes this annoying sound. I'm wondering if it may be a relay possibly, though if it is it might not be the relay itself which is faulty but a symptom of a shortage of charge due to another cause??? Anyone else had something similar or has any ideas?

Thanks
 
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