As I discovered the first time I washed the SR/S, the charging socket has very poor rain/water protection. Not only that, as an upward facing male socket (it has pins in recesses) it is naturally going to collect water, rather than let that water drain away. I can't think of another EV that doesn't have some sort of cover or cap for the charging socket.
I've been on the lookout for a suitable socket cap for a while, without success. There's plenty of plug caps for charging cables, but nothing I could find for sockets. I know Energicas have a socket cap so I decided to phone an Energica dealer, and see if I could buy one from them as a spare part. I spoke to Ivan Donn at Spark Motos, who had just the thing. It turns out that there's a cap fitted as shipping protection to an upgrade kit for a Zero, that they'd recently installed.
It even comes with a lanyard with a push stud on the end. Ivan wouldn't take my money, and posted it out to me free of charge. Absolute star!
I need to work out how to secure the lanyard, but it's perfect for the job. So much so, I wonder why Zero never fitted one in the first place.