@kezo not sure if your last response was to me. We had Nissan Leaf 2nd generation.
I was trying to point out to @oscarmax that in my opinion V2G isn’t quite mainstream, but still at a the level of the first gen Leaf. Of course thats from my point and its not a industry, where I follow its progress closely if I’m honest. Any charging equipment must have a bidirectional converter to perform a similar role to a pv inverter and as such we will see V2G ready (think HD ready tv) chargers aswell as V2G chargers as the industry moves forward.
As to your earlier question, I know Nissan reprpose its Leaf battery’s through its partners EWaton in the US and I think Ecobat in the UK. Whether they have sold on a actual Leaf battery to the public, I find hard to believe, but from scrap yards is a different matter.
To give you an idea how such a battery can easily be used along with a informational video: