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Different battery chemistries have different C-rates, which is the rate at which a battery can be charged and discharged:

https://web.mit.edu/evt/summary_battery_specifications.pdf

https://batteryuniversity.com/index.php/learn/article/what_i...

And generally bigger battery packs can charge at higher kilowatts. Here's an electric ferry with a 4.1 MWh battery which can charge at up 6 megawatts. 600 amps at 10,000 volts:

https://www.youtube.com/watch?v=rE_M1n-ClOA

So, like the ferry, these aircraft probably have big batteries that they charge enough to get to the next destination with a buffer for emergencies. The closer you get to 100% state of charge the slower the system will charge in order to protect the battery.

There's a good video on a Denmark to Sweden ferry that is fully electric: https://www.youtube.com/watch?v=rE_M1n-ClOA

I recently saw this Fully Charged video about a short, but very frequent, ferry crossing that is now fully electric, with automated charging at both ends of the trip

The scale here is enormous, and just for a 4km journey

https://youtu.be/rE_M1n-ClOA

⬐ mncharity

And the new Norwegian ferry Color Hybrid was recently delivered. Not quite twice as large (2k pax, 0.5k cars). Similarly-sized 5-ish MWh batteries, plug-in or diesel-electric. Electric operation around ports, to minimize pollution, and hybrid or diesel elsewhere.