Aldo , that's amazing !! You're lucky .
I bought my '57 in Dec 2012 , within 2 weeks the battery was dead flat !! Me thinking the battery was duff I bought a new one .
Fitted that and that went flat !! I just assumed that it was the nature of the beast , not having had a bike full of electronic gubbins before .
My current BMW has been sat 4 months without needing a charge , so I guess mine had a bit of a leak down problem .