I then pressed the button (I can't remember if it was on the fob or the one in the car) and I heard the solenoid move to release the cable. Was it simply that I waited too long between unlocking the car and removing the cable?
You shouldn't need to press any buttons on the dash or on the FOB, unless you've engaged the auto-lock on the charger handle or there's been a change in design for the 2018 LEAF.
You should be able to simply press in the button on the top of the portable charger's (EVSE) handle and then unplug it - very minimal noise and no beeping (again, unless something has changed on the 2018 LEAF).
I stopped at the Nissan dealer on the way home, and checked -
the connector gets locked in and can only be released by pressing the button inside the car or on the fob. They say this was the same on the old model.
Having read a few more forums - I found a post saying that in North America the cables don't get locked into he car while charging?
In the UK (& the rest of Europe I think) the cable is locked into the car when you start to charge, by a pin going through the hole at the top of the plug. This is the reason the button needs to be pressed.
(On my A3 e-tron, the pin is disengaged when the car is unlocked, and then reengages after about 30 seconds, if the cable has not been removed.)
I've had a crazy idea - and wonder if anyone knows if it would work -
If I cut the top of the plug, so that the pin won't stop the cable pulling out, I could just pull it out in the morning. Not sure if the car would still think the cable was connected, as it does if you just disconnect the other end of the cable from the power.
However, if this is how it works in North America, it should be ok here too?