After only five years the battery died. Let me share here (for my memory) the specs of the new one:
Varta D15 Silver Dynamic 563 400 061, 12V, 63Ah, 610A (‎5634000613162) . Bought ans shipped from amazon but the "real" seller was this one (from the packaging) https://www.ricambi-smc.it/ (they have a warehouse in Italy and another one in Germany)

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2010 Violet Aero Supersports | 2012 Green Vantage S Roadster