Apparently you are supposed to have gotten a LI charger with your V4S couple of months ago my dealer contacted Ducati here in Aus and had one supplied to me as I did not get one either and I brought my V4S in Sept 2018.
Hey mate do you have a picture of this ? I never got one ? My battery hasn't gone flat yet, except for that time I left the Termignoni T-800 plugged in - you don't actually need to, once the mapping has been done. I have a couple of battery chargers, one for bikes and one for cars. The small bike unit worked fine to restore my Ducati battery when it went flat.