644 miles I assume is at 100%, so longevity charging (80%) is 515 miles. That’s a really “take your EV car on a long trip” or “park it at the airport for several days” kind of charge. EV batteries can lose 1-2%/day, so you could feasibly leave it somewhere for a while when you get 515 miles range.
Man, really wished we had something like that at a reasonable cost in the US. I travel for work and have to leave my car idle for long periods, no EV charger in sight. Range like that would be perfect.
Edit: I don’t have an EV. The 1-2% is reported by industry reporters that state that battery conditioning, management, video systems, and system telemetry can consume up to 1-2% per day.